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                                                                     EXHIBIT 4.1

                          ON SEMICONDUCTOR CORPORATION
                   (FORMERLY KNOWN AS SCG HOLDING CORPORATION)

                            2000 STOCK INCENTIVE PLAN
           (AS ADOPTED BY THE BOARD OF DIRECTORS ON FEBRUARY 17, 2000;
                      AMENDED AND RESTATED APRIL 21, 2000;
                       AMENDED AND RESTATED MAY 18, 2001;
                       AMENDED AND RESTATED MAY 23, 2001)

                                    ARTICLE 1
                                     PURPOSE

      1.1   GENERAL. The purpose of the SCG Holding Corporation 2000 Stock
Incentive Plan (the "Plan") is to promote the success and enhance the value of
SCG Holding Corporation (the "Company") by linking the personal interests of its
members of the Board, employees, officers, and executives of, and consultants
and advisors to, the Company to those of Company stockholders and by providing
such individuals with an incentive for outstanding performance in order to
generate superior returns to shareholders of the Company. The Plan is further
intended to provide flexibility to the Company in its ability to motivate,
attract, and retain the services of members of the Board, employees, officers,
and executives of, and consultants and advisors to, the Company upon whose
judgment, interest, and special effort the successful conduct of the Company's
operation is largely dependent.

                                    ARTICLE 2
                                 EFFECTIVE DATE

      2.1   EFFECTIVE DATE. The Plan is effective as of the date the Plan is
approved by the Board (the "Effective Date"). Within 12 months of the Effective
Date, the Plan must be approved by the Company's shareholders. The Plan will be
deemed to be approved by the shareholders if it receives the affirmative vote of
the holders of a majority of the shares of stock of the Company present or
represented and entitled to vote at a meeting duly held in accordance with the
applicable provisions of the Company's Bylaws or by written consent of a
majority of the Company's shareholders in lieu of a meeting. Any awards granted
under the Plan prior to shareholder approval are effective when made (unless the
Committee specifies otherwise at the time of grant), but no Award may be
exercised or settled and no restrictions relating to any Award may lapse before
the Plan is approved by the shareholders as provided above. If the shareholders
fail to approve the Plan, any Award previously made shall be automatically
canceled without any further act.

                                    ARTICLE 3
                          DEFINITIONS AND CONSTRUCTION

      3.1   DEFINITIONS. When a word or phrase appears in this Plan with the
initial letter capitalized, and the word or phrase does not commence a sentence,
the word or phrase shall generally be given the meaning ascribed to it in this
Section or in Sections 1.1 or 2.1 unless a clearly different meaning is required
by the context. The following words and phrases shall have the following
meanings:

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            (a)   "Award" means any Option, Stock Appreciation Right, Restricted
Stock Award, Performance Share Award, Performance-Based Award, or Take Ownership
Grant granted to a Participant under the Plan.

            (b)   "Award Agreement" means any written agreement, contract, or
other instrument or document evidencing an Award.

            (c)   "Board" means the Board of Directors of the Company.

            (d)   "Cause" means (except as otherwise provided in an Award
Agreement) if the Committee, in its reasonable and good faith discretion,
determines that the Participant (i) fails to substantially perform his duties
(other than as a result of Disability), after the Board or the executive to
which the Participant reports delivers to the Participant a written demand for
substantial performance that specifically identifies the manner in which the
Participant has not substantially performed his duties; (ii) engages in willful
misconduct or gross negligence that is materially injurious to the Company or a
Subsidiary; (iii) breaches his duty of loyalty to the Company or a Subsidiary;
(iv) unauthorized removal from the premises of the Company or a Subsidiary of a
document (of any media or form) relating to the Company or a Subsidiary or the
customers of the Company or a Subsidiary; or (v) has committed a felony or a
serious crime involving moral turpitude. Any rights the Company or any of its
Subsidiaries may have hereunder in respect of the events giving rise to Cause
shall be in addition to the rights the Company or any of its Subsidiaries may
have under any other agreement with the Participant or at law or in equity. If,
subsequent to a Participant's termination of employment or services, it is
discovered that such Participant's employment or services could have been
terminated for Cause, the Participant's employment or services shall, at the
election of the Board, in its sole discretion, be deemed to have been terminated
for Cause retroactively to the date the events giving rise to Cause occurred.

            (e)   "Change of Control" shall mean the occurrence of any of the
following events: (i) any sale, lease, exchange, or other transfer (in one
transaction or a series of related transactions) of all or substantially all of
the assets of the Company or the Operating Subsidiary to any Person or group of
related persons for purposes of Section 13(d) of the Exchange Act (a "Group"),
together with any affiliates thereof other than TPG Semiconductor Holdings LLC,
TPG Partners II, L.P., or any of their affiliates (hereafter collectively
referred to as "TPG"); (ii) the approval by the holders of Stock and the
consummation of any plan or proposal for the liquidation or dissolution of the
Company; (iii) (A) any Person or Group (other than TPG) shall become the
beneficial owner, directly or indirectly, of shares representing more than 25%
of the aggregate voting power of the issued and outstanding stock entitled to
vote in the election of directors (the "Voting Stock") of the Company and such
Person or Group has the power and authority to vote such shares and (B) TPG
beneficially owns (within the meaning of Section 13(d) of the Exchange Act),
directly or indirectly, in the aggregate a lesser percentage of the Voting Stock
of the Company than such other Person or Group; (iv) the actual replacement of a
majority of the Board over a two-year period from the individual directors who
constituted the Board at the beginning of such period, and such replacement
shall not have been approved by a vote of at least a majority of the Board then
still in office who either were members of such Board at the beginning of such
period or whose election as a member of such Board was previously so approved or
who were nominated by, or designees of, TPG; (v) any Person or

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Group other than TPG shall have acquired shares of Voting Stock of the Company
such that such Person or Group has the power and authority to elect a majority
of the members of the Board of Directors of the Company; or (vi) the
consummation of a merger or consolidation of the Company with another entity in
which holders of the Stock immediately prior to the consummation of the
transaction hold, directly or indirectly, immediately following the consummation
of the transaction, 50% or less of the common equity interest in the surviving
corporation in such transaction. Notwithstanding the foregoing, in no event
shall a Change of Control be deemed to have occurred as a result of an initial
public offering of the Stock.

            (f)   "Code" means the Internal Revenue Code of 1986, as amended.

            (g)   "Committee" means the committee of the Board described in
Article 4.

            (h)   "Covered Employee" means an Employee who is a "covered
employee" within the meaning of Section 162(m) of the Code.

            (i)   "Disability" shall mean (unless otherwise defined in an
employment agreement between the Company or any of its Subsidiaries and the
Participant or in the Participant's Award Agreement) any illness or other
physical or mental condition of a Participant which renders the Participant
incapable of performing his customary and usual duties for the Company, or any
medically determinable illness or other physical or mental condition resulting
from a bodily injury, disease or mental disorder which in the judgment of the
Committee is permanent and continuous in nature. The Committee may require such
medical or other evidence as it deems necessary to judge the nature and
permanency of the Participant's condition.

            (j)   "Exchange Act" means the Securities Exchange Act of 1934, as
amended.

            (k)   "Fair Market Value" means, as of any given date, the fair
market value of Stock on a particular date determined by such methods or
procedures as may be established from time to time by the Committee. Unless
otherwise determined by the Committee, the Fair Market Value of Stock as of any
date shall be the closing price for the Stock as reported on the NASDAQ National
Market System (or on any national securities exchange on which the Stock is then
listed) for that date or, if no closing price is reported for that date, the
closing price on the next preceding date for which a closing price was reported.

            (l)   "Incentive Stock Option" means an Option that is intended to
meet the requirements of Section 422 of the Code or any successor provision
thereto.

            (m)   "Non-Employee Director" means a member of the Board who
qualifies as a "Non-Employee Director" as defined in Rule 16b-3(b)(3) of the
Exchange Act, or any successor definition adopted by the Board.

            (n)   "Non-Qualified Stock Option" means an Option that is not
intended to be an Incentive Stock Option.

            (o)   "Operating Subsidiary" means Semiconductor Components
Industries, LLC.

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            (p)   "Option" means a right granted to a Participant under Article
7 or Article 12 of the Plan to purchase Stock at a specified price during
specified time periods. An Option may be either an Incentive Stock Option or a
Non-Qualified Stock Option.

            (q)   "Participant" means a person who, as a member of the Board,
employee, officer, or executive of, or consultant or advisor providing services
to, the Company or any Subsidiary, has been granted an Award under the Plan.

            (r)   "Performance-Based Awards" means the Performance Share Awards
and Restricted Stock Awards granted to selected Covered Employees pursuant to
Articles 9 and 10, but which are subject to the terms and conditions set forth
in Article 11. All Performance-Based Awards are intended to qualify as
"performance-based compensation" under Section 162(m) of the Code.

            (s)   "Performance Criteria" means the criteria that the Committee
selects for purposes of establishing the Performance Goal or Performance Goals
for a Participant for a Performance Period. The Performance Criteria that will
be used to establish Performance Goals are limited to the following: pre- or
after-tax net earnings, sales growth, operating earnings, operating cash flow,
return on net assets, return on stockholders' equity, return on assets, return
on capital, Stock price growth, stockholder returns, gross or net profit margin,
earnings per share, price per share of Stock, and market share, any of which may
be measured either in absolute terms or as compared to any incremental increase
or as compared to results of a peer group. The Committee shall, within the time
prescribed by Section 162(m) of the Code, define in an objective fashion the
manner of calculating the Performance Criteria it selects to use for such
Performance Period for such Participant.

            (t)   "Performance Goals" means, for a Performance Period, the goals
established in writing by the Committee for the Performance Period based upon
the Performance Criteria. Depending on the Performance Criteria used to
establish such Performance Goals, the Performance Goals may be expressed in
terms of overall Company performance or the performance of a division, business
unit, or an individual. The Committee, in its discretion, may, within the time
prescribed by Section 162(m) of the Code, adjust or modify the calculation of
Performance Goals for such Performance Period in order to prevent the dilution
or enlargement of the rights of Participants (i) in the event of, or in
anticipation of, any unusual or extraordinary corporate item, transaction,
event, or development, or (ii) in recognition of, or in anticipation of, any
other unusual or nonrecurring events affecting the Company, or the financial
statements of the Company, or in response to, or in anticipation of, changes in
applicable laws, regulations, accounting principles, or business conditions.

            (u)   "Performance Period" means the one or more periods of time,
which may be of varying and overlapping durations, as the Committee may select,
over which the attainment of one or more Performance Goals will be measured for
the purpose of determining a Participant's right to, and the payment of, a
Performance-Based Award.

            (v)   "Performance Share" means a right granted to a Participant
under Article 9, to receive cash, Stock, or other Awards, the payment of which
is contingent upon achieving certain performance goals established by the
Committee.

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            (w)   "Plan" means the SCG Holding Corporation 2000 Stock Incentive
Plan, as amended.

            (x)   "Restricted Stock Award" means Stock granted to a Participant
under Article 10 that is subject to certain restrictions and to risk of
forfeiture.

            (y)   "Stock" means the common stock of the Company and such other
securities of the Company that may be substituted for Stock pursuant to Article
14.

            (z)   "Stock Appreciation Right" or "SAR" means a right granted to a
Participant under Article 8 to receive a payment equal to the difference between
the Fair Market Value of a share of Stock as of the date of exercise of the SAR
over the grant price of the SAR, all as determined pursuant to Article 8.

            (aa)  "Subsidiary" means any corporation or other entity of which a
majority of the outstanding voting stock or voting power is beneficially owned
directly or indirectly by the Company.

            (bb)  "Take Ownership Grant" means the Option granted to each
eligible Participant pursuant to Article 12.

                                    ARTICLE 4
                                 ADMINISTRATION

      4.1   COMMITTEE. The Plan shall be administered by the Board or a
Committee appointed by, and which serves at the discretion of, the Board. If the
Board appoints a Committee, the Committee shall consist of at least two
individuals, each of whom qualifies as (i) a Non-Employee Director, and (ii) an
"outside director" under Code Section 162(m) and the regulations issued
thereunder. Reference to the Committee shall refer to the Board if the Board
does not appoint a Committee.

      4.2   ACTION BY THE COMMITTEE. A majority of the Committee shall
constitute a quorum. The acts of a majority of the members present at any
meeting at which a quorum is present, and acts approved in writing by a majority
of the Committee in lieu of a meeting, shall be deemed the acts of the
Committee. Each member of the Committee is entitled to, in good faith, rely or
act upon any report or other information furnished to that member by any officer
or other employee of the Company or any Subsidiary, the Company's independent
certified public accountants, or any executive compensation consultant or other
professional retained by the Company to assist in the administration of the
Plan.

      4.3   AUTHORITY OF COMMITTEE. Subject to any specific designation in the
Plan, the Committee has the exclusive power, authority and discretion to:

            (a)   Designate Participants to receive Awards;

            (b)   Determine the type or types of Awards to be granted to each
Participant;

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            (c)   Determine the number of Awards to be granted and the number of
shares of Stock to which an Award will relate;

            (d)   Determine the terms and conditions of any Award granted under
the Plan including but not limited to, the exercise price, grant price, or
purchase price, any restrictions or limitations on the Award, any schedule for
lapse of forfeiture restrictions or restrictions on the exercisability of an
Award, and accelerations or waivers thereof, based in each case on such
considerations as the Committee in its sole discretion determines; provided,
however, that the Committee shall not have the authority to accelerate the
vesting or waive the forfeiture of any Performance-Based Awards;

            (e)   Amend, modify, or terminate any outstanding Award, with the
Participant's consent unless the Committee has the authority to amend, modify,
or terminate an Award without the Participant's consent under any other
provision of the Plan.

            (f)   Determine whether, to what extent, and under what
circumstances an Award may be settled in, or the exercise price of an Award may
be paid in, cash, Stock, other Awards, or other property, or an Award may be
canceled, forfeited, or surrendered;

            (g)   Prescribe the form of each Award Agreement, which need not be
identical for each Participant;

            (h)   Decide all other matters that must be determined in connection
with an Award;

            (i)   Establish, adopt, or revise any rules and regulations as it
may deem necessary or advisable to administer the Plan; and

            (j)   Interpret the terms of, and any matter arising under, the Plan
or any Award Agreement;

            (k)   Make all other decisions and determinations that may be
required under the Plan or as the Committee deems necessary or advisable to
administer the Plan.

      4.4   DECISIONS BINDING. The Committee's interpretation of the Plan, any
Awards granted under the Plan, any Award Agreement and all decisions and
determinations by the Committee with respect to the Plan are final, binding, and
conclusive on all parties.

                                    ARTICLE 5
                           SHARES SUBJECT TO THE PLAN

      5.1   NUMBER OF SHARES. Subject to adjustment as provided in section 14.1,
the aggregate number of shares of Stock reserved and available for grant shall
be 13,000,000, plus an additional number of shares of Stock equal to: (i) three
and one-half percent (3.5%) of the total outstanding shares of Stock effective
as of January 1, 2002; and (ii) by four percent (4.0%) of the total outstanding
shares of Stock effective as of January 1, 2003. In determining these increases
of shares reserved for issuance under the Plan, relevant calculations shall be
made on a non-diluted basis, i.e., excluding all shares previously reserved for
issuance under the Plan and any

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other equity incentive plan of the Company. Notwithstanding the foregoing, the
total number of shares available for grant under the Plan as Incentive Stock
Options shall be 10,000,000.

      5.2   LAPSED AWARDS. To the extent that an Award terminates, expires, or
lapses for any reason, any shares of Stock subject to the Award will again be
available for the grant of an Award under the Plan.

      5.3   STOCK DISTRIBUTED. Any Stock distributed pursuant to an Award may
consist, in whole or in part, of authorized and unissued Stock, treasury Stock
or Stock purchased on the open market.

      5.4   LIMITATION ON NUMBER OF SHARES SUBJECT TO AWARDS. Notwithstanding
any provision in the Plan to the contrary, and subject to the adjustment in
Section 14.1, the maximum number of shares of Stock with respect to one or more
Awards that may be granted to any one Participant during the Company's fiscal
year shall be 1,000,000.

                                    ARTICLE 6
                          ELIGIBILITY AND PARTICIPATION

      6.1   ELIGIBILITY.

            (a)   GENERAL. Persons eligible to participate in this Plan include
all members of the Board, employees, officers, and executives of, and
consultants and advisors to, the Company or a Subsidiary, as determined by the
Committee.

            (b)   FOREIGN PARTICIPANTS. Subject to the provisions of Article 16
of the Plan, in order to assure the viability of Awards granted to Participants
employed in foreign countries, the Committee may provide for such special terms
as it may consider necessary or appropriate to accommodate differences in local
law, tax policy, or custom. Moreover, the Committee may approve such supplements
to, or amendments, restatements, or alternative versions of the Plan as it may
consider necessary or appropriate for such purposes without thereby affecting
the terms of the Plan as in effect for any other purpose; provided, however,
that no such supplements, amendments, restatements, or alternative versions
shall increase the share limitations contained in Section 5.1 of the Plan.

      6.2   ACTUAL PARTICIPATION. Subject to the provisions of the Plan, the
Committee may, from time to time, select from among all eligible individuals,
those to whom Awards shall be granted and shall determine the nature and amount
of each Award. No individual shall have any right to be granted an Award under
this Plan.

                                    ARTICLE 7
                                  STOCK OPTIONS

      7.1   GENERAL. The Committee is authorized to grant Options to
Participants on the following terms and conditions:

            (a)   EXERCISE PRICE. The exercise price per share of Stock under an
Option shall be determined by the Committee and set forth in the Award
Agreement. It is the

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intention under the Plan that the exercise price for any Option shall not be
less than the Fair Market Value as of the date of grant; provided, however that
the Committee may, in its discretion, grant Options (other than Options that are
intended to be Incentive Stock Options or Options that are intended to qualify
as performance-based compensation under Code Section 162(m)) with an exercise
price of less than Fair Market Value on the date of grant.

            (b)   TIME AND CONDITIONS OF EXERCISE. The Committee shall determine
the time or times at which an Option may be exercised in whole or in part. The
Committee shall also determine the performance or other conditions, if any, that
must be satisfied before all or part of an Option may be exercised. Unless
otherwise provided in an Award Agreement, an Option will lapse immediately if a
Participant's employment or services are terminated for Cause.

            (c)   PAYMENT. The Committee shall determine the methods by which
the exercise price of an Option may be paid, the form of payment, including,
without limitation, cash, promissory note, shares of Stock (through actual
tender or by attestation), or other property (including broker-assisted
"cashless exercise" arrangements), and the methods by which shares of Stock
shall be delivered or deemed to be delivered to Participants.

            (d)   EVIDENCE OF GRANT. All Options shall be evidenced by a written
Award Agreement between the Company and the Participant. The Award Agreement
shall include such additional provisions as may be specified by the Committee.

      7.2   INCENTIVE STOCK OPTIONS. Incentive Stock Options shall be granted
only to employees and the terms of any Incentive Stock Options granted under the
Plan must comply with the following additional rules:

            (a)   EXERCISE PRICE. The exercise price per share of Stock shall be
set by the Committee, provided that the exercise price for any Incentive Stock
Option may not be less than the Fair Market Value as of the date of the grant.

            (b)   EXERCISE. In no event, may any Incentive Stock Option be
exercisable for more than ten years from the date of its grant.

            (c)   LAPSE OF OPTION. An Incentive Stock Option shall lapse under
the following circumstances.

                  (1)   The Incentive Stock Option shall lapse ten years from
      the date it is granted, unless an earlier time is set in the Award
      Agreement.

                  (2)   The Incentive Stock Option shall lapse upon termination
      of employment for Cause or for any other reason, other than the
      Participant's death or Disability, unless otherwise provided in the Award
      Agreement.

                  (3)   If the Participant terminates employment on account of
      Disability or death before the Option lapses pursuant to paragraph (1) or
      (2) above, the Incentive Stock Option shall lapse, unless it is previously
      exercised, on the earlier of (i) the date on which the Option would have
      lapsed had the Participant not become Disabled or lived

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      and had his employment status (i.e., whether the Participant was employed
      by the Company on the date of his Disability or death or had previously
      terminated employment) remained unchanged; or (ii) 12 months after the
      date of the Participant's termination of employment on account of
      Disability or death. Upon the Participant's Disability or death, any
      Incentive Stock Options exercisable at the Participant's Disability or
      death may be exercised by the Participant's legal representative or
      representatives, by the person or persons entitled to do so under the
      Participant's last will and testament, or, if the Participant fails to
      make testamentary disposition of such Incentive Stock Option or dies
      intestate, by the person or persons entitled to receive the Incentive
      Stock Option under the applicable laws of descent and distribution.

            (d)   INDIVIDUAL DOLLAR LIMITATION. The aggregate Fair Market Value
(determined as of the time an Award is made) of all shares of Stock with respect
to which Incentive Stock Options are first exercisable by a Participant in any
calendar year may not exceed $100,000.00 or such other limitation as imposed by
Section 422(d) of the Code, or any successor provision. To the extent that
Incentive Stock Options are first exercisable by a Participant in excess of such
limitation, the excess shall be considered Non-Qualified Stock Options.

            (e)   TEN PERCENT OWNERS. An Incentive Stock Option shall be granted
to any individual who, at the date of grant, owns stock possessing more than ten
percent of the total combined voting power of all classes of Stock of the
Company only if such Option is granted at a price that is not less than 110% of
Fair Market Value on the date of grant and the Option is exercisable for no more
than five years from the date of grant.

            (f)   EXPIRATION OF INCENTIVE STOCK OPTIONS. No Award of an
Incentive Stock Option may be made pursuant to this Plan after the tenth
anniversary of the Effective Date.

            (g)   RIGHT TO EXERCISE. During a Participant's lifetime, an
Incentive Stock Option may be exercised only by the Participant.

                                    ARTICLE 8
                            STOCK APPRECIATION RIGHTS

      8.1   GRANT OF SARS. The Committee is authorized to grant SARs to
Participants on the following terms and conditions:

            (a)   RIGHT TO PAYMENT. Upon the exercise of a Stock Appreciation
Right, the Participant to whom it is granted has the right to receive the
excess, if any, of:

                  (1)   The Fair Market Value of a share of Stock on the date of
      exercise; over

                  (2)   The grant price of the Stock Appreciation Right as
      determined by the Committee, which shall not be less than the Fair Market
      Value of a share of Stock on the date of grant in the case of any SAR
      related to any Incentive Stock Option.

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            (b)   OTHER TERMS. All awards of Stock Appreciation Rights shall be
evidenced by an Award Agreement. The terms, methods of exercise, methods of
settlement, form of consideration payable in settlement, and any other terms and
conditions of any Stock Appreciation Right shall be determined by the Committee
at the time of the grant of the Award and shall be reflected in the Award
Agreement.

                                    ARTICLE 9
                               PERFORMANCE SHARES

      9.1   GRANT OF PERFORMANCE SHARES. The Committee is authorized to grant
Performance Shares to Participants on such terms and conditions as may be
selected by the Committee. The Committee shall have the complete discretion to
determine the number of Performance Shares granted to each Participant. All
Awards of Performance Shares shall be evidenced by an Award Agreement.

      9.2   RIGHT TO PAYMENT. A grant of Performance Shares gives the
Participant rights, valued as determined by the Committee, and payable to, or
exercisable by, the Participant to whom the Performance Shares are granted, in
whole or in part, as the Committee shall establish at grant or thereafter.
Subject to the terms of the Plan, the Committee shall set performance goals and
other terms or conditions to payment of the Performance Shares in its discretion
which, depending on the extent to which they are met, will determine the number
and value of Performance Shares that will be paid to the Participant.

      9.3   OTHER TERMS. Performance Shares may be payable in cash, Stock, or
other property, and have such other terms and conditions as determined by the
Committee and reflected in the Award Agreement.

                                   ARTICLE 10
                             RESTRICTED STOCK AWARDS

      10.1  GRANT OF RESTRICTED STOCK. The Committee is authorized to make
Awards of Restricted Stock to Participants in such amounts and subject to such
terms and conditions as determined by the Committee. All Awards of Restricted
Stock shall be evidenced by a Restricted Stock Award Agreement.

      10.2  ISSUANCE AND RESTRICTIONS. Restricted Stock shall be subject to such
restrictions on transferability and other restrictions as the Committee may
impose (including, without limitation, limitations on the right to vote
Restricted Stock or the right to receive dividends on the Restricted Stock).
These restrictions may lapse separately or in combination at such times, under
such circumstances, in such installments, or otherwise, as the Committee
determines at the time of the grant of the Award or thereafter.

      10.3  FORFEITURE. Except as otherwise determined by the Committee at the
time of the grant of the Award or thereafter, upon termination of employment
during the applicable restriction period, Restricted Stock that is at that time
subject to restrictions shall be forfeited, provided, however, that the
Committee may provide in any Restricted Stock Award Agreement that restrictions
or forfeiture conditions relating to Restricted Stock will be waived in whole or
in

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part in the event of terminations resulting from specified causes, and the
Committee may in other cases waive in whole or in part restrictions or
forfeiture conditions relating to Restricted Stock.

      10.4  CERTIFICATES FOR RESTRICTED STOCK. Restricted Stock granted under
the Plan may be evidenced in such manner as the Committee shall determine. If
certificates representing shares of Restricted Stock are registered in the name
of the Participant, certificates must bear an appropriate legend referring to
the terms, conditions, and restrictions applicable to such Restricted Stock, and
the Company may, at its discretion, retain physical possession of the
certificate until such time as all applicable restrictions lapse.

                                   ARTICLE 11
                            PERFORMANCE-BASED AWARDS

      11.1  PURPOSE. The purpose of this Article 11 is to provide the Committee
the ability to qualify the Performance Share Awards under Article 9 and the
Restricted Stock Awards under Article 10 as "performance-based compensation"
under Section 162(m) of the Code. If the Committee, in its discretion, decides
to grant a Performance-Based Award to a Covered Employee, the provisions of this
Article 11 shall control over any contrary provision contained in Articles 9 or
10.

      11.2  APPLICABILITY. This Article 11 shall apply only to those Covered
Employees selected by the Committee to receive Performance-Based Awards. The
Committee may, in its discretion, grant Restricted Stock Awards or Performance
Share Awards to Covered Employees that do not satisfy the requirements of this
Article 11. The designation of a Covered Employee as a Participant for a
Performance Period shall not in any manner entitle the Participant to receive an
Award for the period. Moreover, designation of a Covered Employee as a
Participant for a particular Performance Period shall not require designation of
such Covered Employee as a Participant in any subsequent Performance Period and
designation of one Covered Employee as a Participant shall not require
designation of any other Covered Employees as a Participant in such period or in
any other period.

      11.3  DISCRETION OF COMMITTEE WITH RESPECT TO PERFORMANCE AWARDS. With
regard to a particular Performance Period, the Committee shall have full
discretion to select the length of such Performance Period, the type of
Performance-Based Awards to be issued, the kind and/or level of the Performance
Goal, and whether the Performance Goal is to apply to the Company, a Subsidiary
or any division or business unit thereof.

      11.4  PAYMENT OF PERFORMANCE AWARDS. Unless otherwise provided in the
relevant Award Agreement, a Participant must be employed by the Company or a
Subsidiary on the last day of the Performance Period to be eligible for a
Performance Award for such Performance Period. Furthermore, a Participant shall
be eligible to receive payment under a Performance-Based Award for a Performance
Period only if the Performance Goals for such period are achieved. In
determining the actual size of an individual Performance-Based Award, the
Committee may reduce or eliminate the amount of the Performance-Based Award
earned for the Performance Period, if in its sole and absolute discretion, such
reduction or elimination is appropriate.

                                                                              11
<PAGE>   12
      11.5  MAXIMUM AWARD PAYABLE. The maximum Performance-Based Award payable
to any one Participant under the Plan for a Performance Period is 1,000,000
shares of Stock, or in the event the Performance-Based Award is paid in cash,
such maximum Performance-Based Award shall be determined by multiplying
1,000,000 by the Fair Market Value of one share of Stock as of the date of grant
of the Performance-Based Award.

                                   ARTICLE 12
                              TAKE OWNERSHIP GRANTS

      12.1  TAKE OWNERSHIP GRANTS. The Take Ownership Grants shall be awarded to
Participants selected by the Committee and shall be subject to the following
terms and conditions:

            (a)   EFFECTIVE DATE OF GRANTS. The effective date of the Take
Ownership Grants shall be on the day on which the Company's initial public
offering of Stock is consummated; provided, however, that Take Ownership Grants
shall not be made to those persons who are not United States residents if the
jurisdiction in which any such person resides prohibits such Grants or makes it
impractical for the Company to make such Grants.

            (b)   EXERCISE PRICE FOR GRANTS. Notwithstanding any other provision
hereof, the exercise price per share of Stock under the Take Ownership Grants
shall be the price at which the Company's Stock is offered under its initial
public offering of Stock ("IPO Price"), provided, however, that, with respect to
Participants who do not reside in the United States, if the day on which the
Company receives approval by the applicable foreign jurisdiction to offer Stock
to Participants residing in that jurisdiction is later than the day on which the
Company's initial public offering becomes effective, the exercise price per
share of Stock under the Take Ownership Grants shall be the Fair Market Value on
the day on which the Company receives approval by the applicable foreign
jurisdiction to offer Stock to such Participants.

            (c)   AMOUNT OF THE TAKE OWNERSHIP GRANTS. Each Participant selected
to receive a Take Ownership Grant shall be entitled to receive an Option to
purchase 50 shares of Stock. Such Option shall be designated as a Non-Qualified
Stock Option.

            (d)   TIME AND CONDITIONS OF EXERCISE. The Take Ownership Grants
shall become fully exercisable on the second anniversary of the date of grant.

            (e)   PAYMENT. The Committee shall determine the methods by which
the exercise price of the Take Ownership Grants may be paid, the form of
payment, including, without limitation, cash, promissory note, shares of Stock
(through actual tender or by attestation), or other property (including
broker-assisted "cashless exercise" arrangements), and the methods by which
shares of Stock shall be delivered or deemed to be delivered to Participants.

            (f)   EVIDENCE OF GRANT. All Take Ownership Grants shall be
evidenced by a written Award Agreement between the Company and the Participant.
The Award Agreement shall provide that upon a Participant's termination of
employment or service with the Company or a Subsidiary for any reason, the
Participant may, at any time within 90 days after the effective date of the
Participant's termination, exercise the Take Ownership Grant to the

                                                                              12
<PAGE>   13
extent that the Participant was entitled to exercise the Take Ownership Grant at
the date of termination, provided that in no event shall the Take Ownership
Grant be exercisable after its expiration date, as provided in the Award
Agreement. The Award Agreement shall also include such other provisions as
determined by the Committee.

                                   ARTICLE 13
                         PROVISIONS APPLICABLE TO AWARDS

      13.1  STAND-ALONE AND TANDEM AWARDS. Awards granted under the Plan may, in
the discretion of the Committee, be granted either alone, in addition to, or in
tandem with, any other Award granted under the Plan. Awards granted in addition
to or in tandem with other Awards may be granted either at the same time as or
at a different time from the grant of such other Awards.

      13.2  EXCHANGE PROVISIONS. The Committee may at any time offer to exchange
or buy out any previously granted Award for a payment in cash, Stock, or another
Award, based on the terms and conditions the Committee determines and
communicates to the Participant at the time the offer is made.

      13.3 TERM OF AWARD. The term of each Award shall be for the period as
determined by the Committee, provided that in no event shall the term of any
Incentive Stock Option or a Stock Appreciation Right granted in tandem with the
Incentive Stock Option exceed a period of ten years from the date of its grant.

      13.4  FORM OF PAYMENT FOR AWARDS. Subject to the terms of the Plan and any
applicable law or Award Agreement, payments or transfers to be made by the
Company or a Subsidiary on the grant or exercise of an Award may be made in such
forms as the Committee determines at or after the time of grant, including
without limitation, cash, promissory note, Stock, other Awards, or other
property, or any combination, and may be made in a single payment or transfer,
in installments, or on a deferred basis, in each case determined in accordance
with rules adopted by, and at the discretion of, the Committee.

      13.5  LIMITS ON TRANSFER. No right or interest of a Participant in any
Award may be pledged, encumbered, or hypothecated to or in favor of any party
other than the Company or a Subsidiary, or shall be subject to any lien,
obligation, or liability of such Participant to any other party other than the
Company or a Subsidiary. Except as otherwise provided by the Committee, no Award
shall be assignable or transferable by a Participant other than by will or the
laws of descent and distribution.

      13.6  BENEFICIARIES. Notwithstanding Section 13.5, a Participant may, in
the manner determined by the Committee, designate a beneficiary to exercise the
rights of the Participant and to receive any distribution with respect to any
Award upon the Participant's death. A beneficiary, legal guardian, legal
representative, or other person claiming any rights under the Plan is subject to
all terms and conditions of the Plan and any Award Agreement applicable to the
Participant, except to the extent the Plan and Award Agreement otherwise
provide, and to any additional restrictions deemed necessary or appropriate by
the Committee. If

                                                                              13
<PAGE>   14
the Participant is married, a designation of a person other than the
Participant's spouse as his beneficiary with respect to more than 50% of the
Participant's interest in the Award shall not be effective without the written
consent of the Participant's spouse. If no beneficiary has been designated or
survives the Participant, payment shall be made to the person entitled thereto
under the Participant's will or the laws of descent and distribution. Subject to
the foregoing, a beneficiary designation may be changed or revoked by a
Participant at any time provided the change or revocation is filed with the
Committee.

      13.7  STOCK CERTIFICATES. Notwithstanding anything herein to the contrary,
the Company shall not be required to issue or deliver any certificates
evidencing shares of Stock pursuant to the exercise of any Awards, unless and
until the Board has determined, with advice of counsel, that the issuance and
delivery of such certificates is in compliance with all applicable laws,
regulations of governmental authorities and, if applicable, the requirements of
any exchange on which the shares of Stock are listed or traded. All Stock
certificates delivered under the Plan are subject to any stop-transfer orders
and other restrictions as the Committee deems necessary or advisable to comply
with Federal, state, or foreign jurisdiction, securities or other laws, rules
and regulations and the rules of any national securities exchange or automated
quotation system on which the Stock is listed, quoted, or traded. The Committee
may place legends on any Stock certificate to reference restrictions applicable
to the Stock. In addition to the terms and conditions provided herein, the Board
may require that a Participant make such reasonable covenants, agreements, and
representations as the Board, in its discretion, deems advisable in order to
comply with any such laws, regulations, or requirements.

      13.8  ACCELERATION UPON A CHANGE OF CONTROL. At the time of the grant of
an Option, Stock Appreciation Right or other Award or any time thereafter, the
Board shall have the authority and discretion, but shall not have any
obligation, to provide for the acceleration of the vesting and exercisability of
any outstanding Option, Stock Appreciation Right or other Award upon a Change in
Control.

                                   ARTICLE 14
                          CHANGES IN CAPITAL STRUCTURE

      14.1  GENERAL.

            (a)   SHARES AVAILABLE FOR GRANT. In the event of any change in the
number of shares of Stock outstanding by reason of any stock dividend or split,
recapitalization, merger, consolidation, combination or exchange of shares or
similar corporate change, the maximum aggregate number of shares of Stock with
respect to which the Committee may grant Awards shall be appropriately adjusted
by the Committee. In the event of any change in the number of shares of Stock
outstanding by reason of any other event or transaction, the Committee may, but
need not, make such adjustments in the number and class of shares of Stock with
respect to which Awards may be granted as the Committee may deem appropriate.

            (b)   OUTSTANDING AWARDS - INCREASE OR DECREASE IN ISSUED SHARES
WITHOUT CONSIDERATION. Subject to any required action by the shareholders of the
Company, in the event of any increase or decrease in the number of issued shares
of Stock resulting from a subdivision or consolidation of shares of Stock or the
payment of a stock

                                                                              14
<PAGE>   15
dividend (but only on the shares of Stock), or any other increase or decrease in
the number of such shares effected without receipt or payment of consideration
by the Company, the Committee shall proportionally adjust the number of shares
of Stock subject to each outstanding Award and the exercise price per share of
Stock of each such Award.

            (c)   OUTSTANDING AWARDS - CERTAIN MERGERS. Subject to any required
action by the shareholders of the Company, in the event that the Company shall
be the surviving corporation in any merger or consolidation (except a merger or
consolidation as a result of which the holders of shares of Stock receive
securities of another corporation), each Award outstanding on the date of such
merger or consolidation shall pertain to and apply to the securities which a
holder of the number of shares of Stock subject to such Award would have
received in such merger or consolidation.

            (d)   OUTSTANDING AWARDS - CERTAIN OTHER TRANSACTIONS. In the event
of (i) a dissolution or liquidation of the Company, (ii) a sale of all or
substantially all of the Company's assets, (iii) a merger or consolidation
involving the Company in which the Company is not the surviving corporation or
(iv) a merger or consolidation involving the Company in which the Company is the
surviving corporation but the holders of shares of Stock receive securities of
another corporation and/or other property, including cash, the Committee shall,
in its absolute discretion, have the power to:

                  (1)   cancel, effective immediately prior to the occurrence of
      such event, each Award outstanding immediately prior to such event
      (whether or not then exercisable), and, in full consideration of such
      cancellation, pay to the Participant to whom such Award was granted an
      amount in cash, for each share of Stock subject to such Award,
      respectively, equal to the excess of (A) the value, as determined by the
      Committee in its absolute discretion, of the property (including cash)
      received by the holder of a share of Stock as a result of such event over
      (B) the exercise of such Award; or

                  (2)   provide for the exchange of each Award outstanding
      immediately prior to such event (whether or not then exercisable) for an
      option, a stock appreciation right, restricted stock award, performance
      share award or performance-based award with respect to, as appropriate,
      some or all of the property for which such Award is exchanged and,
      incident thereto, make an equitable adjustment as determined by the
      Committee in its absolute discretion in the exercise price or value of the
      option, stock appreciate right, restricted stock award, performance share
      award or performance-based award or the number of shares or amount of
      property subject to the option, stock appreciation right, restricted stock
      award, performance share award or performance-based award or, if
      appropriate, provide for a cash payment to the Participant to whom such
      Award was granted in partial consideration for the exchange of the Award.

            (e)   OUTSTANDING AWARDS - OTHER CHANGES. In the event of any other
change in the capitalization of the Company or corporate change other than those
specifically referred to in Article 14, the Committee may, in its absolute
discretion, make such adjustments in the number and class of shares subject to
Awards outstanding on the date on

                                                                              15
<PAGE>   16
which such change occurs and in the per share exercise price of each Award as
the Committee may consider appropriate to prevent dilution or enlargement of
rights.

            (f)   NO OTHER RIGHTS. Except as expressly provided in the Plan, no
Participant shall have any rights by reason of any subdivision or consolidation
of shares of stock of any class, the payment of any dividend, any increase or
decrease in the number of shares of stock of any class or any dissolution,
liquidation, merger, or consolidation of the Company or any other corporation.
Except as expressly provided in the Plan, no issuance by the Company of shares
of stock of any class, or securities convertible into shares of stock of any
class, shall affect, and no adjustment by reason thereof shall be made with
respect to, the number of shares of Stock subject to an Award or the exercise
price of any Award.

                                   ARTICLE 15
                    AMENDMENT, MODIFICATION, AND TERMINATION

      15.1  AMENDMENT, MODIFICATION, AND TERMINATION. With the approval of the
Board, at any time and from time to time, the Committee may terminate, amend or
modify the Plan; provided, however, that to the extent necessary and desirable
to comply with any applicable law, regulation, or stock exchange rule, the
Company shall obtain shareholder approval of any Plan amendment in such a manner
and to such a degree as required.

      15.2  AWARDS PREVIOUSLY GRANTED. Except as otherwise provided in the Plan,
including without limitation, the provisions of Article 14, no termination,
amendment, or modification of the Plan shall adversely affect in any material
way any Award previously granted under the Plan, without the written consent of
the Participant.

                                   ARTICLE 16
                     PROVISIONS RELATING TO FRENCH EMPLOYEES

      Notwithstanding any other provisions of the Plan to the contrary, the
following provisions shall apply to Awards granted to any employee who is a
French citizen or who works primarily in France as of the grant date (referred
to herein as "French Employee").

      16.1  CONSULTANTS. Notwithstanding anything to the contrary herein, no
French Employee who would otherwise be considered a consultant under French law
may be granted an Award under the Plan.

      16.2  TERMINATION FOR CAUSE. The last sentence of Section 3.1(d)
(definition of Cause) shall not apply to French Employees.

      16.3  TEN PERCENT OWNERS. Notwithstanding Section 6.1(a) above, no Award
shall be granted to any French Employee who holds more than ten percent of the
Stock on the grant date.

      16.4  EXERCISE PRICE. Notwithstanding Section 7.1(a) above, all Awards
granted to French Employees shall be granted at an exercise price per share
equal to Fair Market Value per share as of the grant date.

                                                                              16
<PAGE>   17
      16.5  TIME LIMITATIONS. No Options shall be granted to any French Employee
five years after the later of (a) the date the Company's stockholders initially
approved the Plan, or (b) the date the Plan has been subsequently re-authorized,
in its original form or as amended from time to time by the Board, by the
Company's stockholders.

      16.6  VESTING OF OPTIONS. Notwithstanding Section 7.1(b) above, no portion
of any Award granted to a French Employee shall become exercisable before the
five-year anniversary of the grant date.

      16.7  EFFECT OF PARTICIPANT'S DEATH. Notwithstanding Section 7.1(b) or any
other provision hereof, upon a French Employee's death, the vested portion of
such Participant's Award shall remain exercisable for a period of six months
after the date of his death and shall be exercisable by his heirs.

      16.8  EXCHANGE OF OPTIONS. Notwithstanding Section 13.2 above, the Company
shall not terminate any portion of an Award granted to any French Employee.

      16.9  ADJUSTMENT OF OPTIONS. Notwithstanding Section 14.1 herein, any
adjustment made to any Award granted to a French Employee shall comply with
applicable French law.

                                   ARTICLE 17
                               GENERAL PROVISIONS

      17.1  NO RIGHTS TO AWARDS. No Participant, employee, or other person shall
have any claim to be granted any Award under the Plan, and neither the Company
nor the Committee is obligated to treat Participants, employees, and other
persons uniformly.

      17.2  NO STOCKHOLDERS RIGHTS. No Award gives the Participant any of the
rights of a stockholder of the Company unless and until shares of Stock are in
fact issued to such person in connection with such Award.

      17.3  WITHHOLDING. The Company or any Subsidiary shall have the authority
and the right to deduct or withhold, or require a Participant to remit to the
Company, an amount sufficient to satisfy Federal, state, and local taxes
(including the Participant's FICA obligation) required by law to be withheld
with respect to any taxable event arising as a result of this Plan. With the
Committee's consent, a Participant may elect to have the Company withhold from
those Stock that would otherwise be received upon the exercise of any Option, a
number of shares having a Fair Market Value equal to the minimum statutory
amount necessary to satisfy the Company's applicable federal, state, local and
foreign income and employment tax withholding obligations.

      17.4  NO RIGHT TO EMPLOYMENT OR SERVICES. Nothing in the Plan or any Award
Agreement shall interfere with or limit in any way the right of the Company or
any Subsidiary to terminate any Participant's employment or services at any
time, nor confer upon any Participant any right to continue in the employ of the
Company or any Subsidiary.

                                                                              17
<PAGE>   18
      17.5  UNFUNDED STATUS OF AWARDS. The Plan is intended to be an "unfunded"
plan for incentive compensation. With respect to any payments not yet made to a
Participant pursuant to an Award, nothing contained in the Plan or any Award
Agreement shall give the Participant any rights that are greater than those of a
general creditor of the Company or any Subsidiary.

      17.6  INDEMNIFICATION. To the extent allowable under applicable law, each
member of the Committee or of the Board shall be indemnified and held harmless
by the Company from any loss, cost, liability, or expense that may be imposed
upon or reasonably incurred by such member in connection with or resulting from
any claim, action, suit, or proceeding to which he or she may be a party or in
which he or she may be involved by reason of any action or failure to act under
the Plan and against and from any and all amounts paid by him or her in
satisfaction of judgment in such action, suit, or proceeding against him or her
provided he or she gives the Company an opportunity, at its own expense, to
handle and defend the same before he or she undertakes to handle and defend it
on his or her own behalf. The foregoing right of indemnification shall not be
exclusive of any other rights of indemnification to which such persons may be
entitled under the Company's Articles of Incorporation or Bylaws, as a matter of
law, or otherwise, or any power that the Company may have to indemnify them or
hold them harmless.

      17.7  RELATIONSHIP TO OTHER BENEFITS. No payment under the Plan shall be
taken into account in determining any benefits under any pension, retirement,
savings, profit sharing, group insurance, welfare or other benefit plan of the
Company or any Subsidiary.

      17.8  EXPENSES. The expenses of administering the Plan shall be borne by
the Company and its Subsidiaries.

      17.9  TITLES AND HEADINGS. The titles and headings of the Sections in the
Plan are for convenience of reference only, and in the event of any conflict,
the text of the Plan, rather than such titles or headings, shall control.

      17.10 FRACTIONAL SHARES. No fractional shares of stock shall be issued and
the Committee shall determine, in its discretion, whether cash shall be given in
lieu of fractional shares or whether such fractional shares shall be eliminated
by rounding up or down as appropriate.

      17.11 SECURITIES LAW COMPLIANCE. With respect to any person who is, on the
relevant date, obligated to file reports under Section 16 of the Exchange Act,
transactions under this Plan are intended to comply with all applicable
conditions of Rule 16b-3 or its successors under the Exchange Act. To the extent
any provision of the Plan or action by the Committee fails to so comply, it
shall be void to the extent permitted by law and voidable as deemed advisable by
the Committee.

      17.12 GOVERNMENT AND OTHER REGULATIONS. The obligation of the Company to
make payment of awards in Stock or otherwise shall be subject to all applicable
laws, rules, and regulations, and to such approvals by government agencies as
may be required. The Company shall be under no obligation to register under the
Securities Act of 1933, as

                                                                              18
<PAGE>   19
amended, any of the shares of Stock paid under the Plan. If the shares paid
under the Plan may in certain circumstances be exempt from registration under
the Securities Act of 1933, as amended, the Company may restrict the transfer of
such shares in such manner as it deems advisable to ensure the availability of
any such exemption.

      17.13 GOVERNING LAW. The Plan and all Award Agreements shall be construed
in accordance with and governed by the laws of the State of Delaware.

                                                                              19<PAGE>   1
                                                                     EXHIBIT 4.2

                          ON SEMICONDUCTOR CORPORATION
                   (FORMERLY KNOWN AS SCG HOLDING CORPORATION)

                        2000 EMPLOYEE STOCK PURCHASE PLAN
           (AS ADOPTED BY THE BOARD OF DIRECTORS ON FEBRUARY 17, 2000;
                      AMENDED AND RESTATED APRIL 21, 2000;
                       AMENDED AND RESTATED MAY 23, 2001)

      1.    PURPOSE. The purpose of this SCG Holding Corporation 2000 Employee
Stock Purchase Plan (the "Plan") is to encourage stock ownership by eligible
employees of SCG Holding Corporation (the "Company") and its Subsidiaries and
thereby provide employees with an incentive to contribute to the profitability
and success of the Company. The Plan is intended to qualify as an "employee
stock purchase plan" under Section 423 of the Code and will be maintained for
the exclusive benefit of eligible employees of the Company and its Subsidiaries.

      2.    DEFINITIONS. For purposes of the Plan, in addition to the terms
defined in Section 1, the following terms are defined:

            (a)   "Board" means the Board of Directors of the Company.

            (b)   "Cash Account" means the account maintained on behalf of a
Participant by the Company for the purpose of holding cash contributions
withheld from payroll pending investment in Stock.

            (c)   "Code" means the Internal Revenue Code of 1986, as amended.

            (d)   "Custodian" means Solomon Smith Barney or any successor or
replacement appointed by the Board or its delagatee under Section 3(a).

            (e)   "Earnings" means a Participant's salary or wages, including
bonuses, for services performed for the Company and its Subsidiaries and
received by a Participant for services rendered during an Offering Period.

            (f)   "Fair Market Value" means the closing price of the Stock on
the relevant date as reported on NASDAQ (or any national securities exchange or
quotation system on which the Stock is then listed), or if there were no sales
on that date the closing price on the next preceding date for which a closing
price was reported; provided, however, that for any Offering Period beginning on
the IPO Date, the Fair Market Value of the Stock on the first day of such
Offering Period shall be deemed to be the price at which the Company's Stock is
offered under its initial public offering of Stock.

            (g)   "IPO Date" means the date on which the Company's initial
public offering of Stock is consummated.

            (h)   "Offering Period" means the period beginning on the IPO Date
and ending on the last day of the next calendar quarter, and every three-month
period thereafter. For

                                                                               1
<PAGE>   2
Participants who do not reside in the United States, if the day on which the
Company receives approval by the applicable foreign jurisdiction to offer common
stock to Participants residing in that jurisdiction is later than the day on
which the Company's initial public offering becomes effective, the Offering
Period means the period beginning on the day on which the Company receives
approval by the applicable foreign jurisdiction to offer common stock to such
Participants and ending on the last day of the next calendar quarter, and every
three-month period thereafter.

            (i)   "Participant" means an employee of the Company or a Subsidiary
who is participating in the Plan.

            (j)   "Purchase Right" means a Participant's option to purchase
Stock that is deemed to be outstanding during an Offering Period. A Purchase
Right represents an "option" under Section 423 of the Code.

            (k)   "Stock" means the common stock of the Company.

            (l)   "Stock Account" means the account maintained on behalf of the
Participant by the Custodian for the purpose of holding Stock acquired under the
Plan.

            (m)   "Subsidiary" means any corporation (other than the Company) in
an unbroken chain of corporations beginning with the Company if each of the
corporations (other than the last corporation in the unbroken chain) owns stock
possessing 50% or more of the total combined voting power of all classes of
stock in one of the other corporations in the chain as set forth in Code Section
424(f).

      3.    ADMINISTRATION.

            (a)   Board Administration. The Plan will be administered by the
Board. The Board may delegate its administrative duties and authority (other
than its authority to amend the Plan) to any Board committee or to any officers
or employees or committee thereof as the Board may designate (in which case
references to the Board will be deemed to refer to the administrator to which
such duties and authority have been delegated). The Board will have full
authority to adopt, amend, suspend, waive, and rescind rules and regulations and
appoint agents as it deems necessary or advisable to administer the Plan, to
correct any defect or supply any omission or reconcile any inconsistency in the
Plan and to construe and interpret the Plan and rules and regulations
thereunder, to furnish to the Custodian such information as the Custodian may
require, and to make all other decisions and determinations under the Plan
(including determinations relating to eligibility). No person acting in
connection with the administration of the Plan will, in that capacity,
participate in deciding any matter relating to his or her participation in the
Plan.

            (b)   The Custodian. The Custodian will act as custodian under the
Plan, and will perform duties under the Plan and in any agreement between the
Company and the Custodian. The Custodian will establish and maintain
Participants Stock Accounts and any subaccounts as may be necessary or desirable
to administer the Plan.

                                                                               2
<PAGE>   3
            (c)   Waivers. The Board may waive or modify any requirement that a
notice or election be made or filed under the Plan a specified period in advance
on an individual case or by adopting a rule or regulation under the Plan,
without amending the Plan.

            (d)   Other Administrative Provisions. The Company will furnish
information from its records as directed by the Board, and such records,
including a Participant's Earnings, will be conclusive on all persons unless
determined by the Board to be incorrect. Each Participant and other person
claiming benefits under the Plan must furnish to the Company in writing an
up-to-date mailing address and any other information as the Board or Custodian
may reasonably request. Any communication, statement, or notice mailed with
postage prepaid to any such Participant or other person at the last mailing
address filed with the Company will be deemed sufficiently given when mailed and
will be binding upon the named recipient. The Plan will be administered on a
reasonable and nondiscriminatory basis and uniform rules will apply to all
persons similarly situated. All Participants will have equal rights and
privileges (subject to the terms of the Plan) with respect to Purchase Right
outstanding during any given Offering Period in accordance with Code Section
423(b)(5).

      4.    STOCK SUBJECT TO PLAN. Subject to adjustment as provided below, the
total number of shares of Stock reserved and available for issuance or which may
be otherwise acquired upon exercise of Purchase Rights under the Plan will be
5,500,000. If, at the end of any Offering Period, the number of shares of Stock
with respect to which Purchase Rights are to be exercised exceeds the number of
shares of Stock then available under the Plan, the Board shall make a pro rata
allocation of the shares of Stock remaining available for purchase in as uniform
a manner as shall be practicable and as it shall determine to be equitable. Any
shares of Stock delivered by the Company under the Plan may consist, in whole or
in part, of authorized and unissued shares or treasury shares or shares of Stock
purchased on the open market. The number and kind of such shares of Stock
subject to the Plan will be proportionately adjusted, as determined by the
Board, in the event of any extraordinary dividend or other distribution,
recapitalization, forward or reverse split, reorganization, merger,
consolidation, spin-off, combination, repurchase, or share exchange, or other
similar corporate transaction or event affecting the Stock.

      5.    ENROLLMENT AND CONTRIBUTIONS.

            (a)   Eligibility. An employee of the Company or any Subsidiary
designated by the Board may be enrolled in the Plan for any Offering Period if
such employee is employed by the Company or a Subsidiary authorized to
participate in the Plan on the first day of the Offering Period, unless one of
the following applies to the employee:

                  (i)   such person has been employed by the Company or a
                        Subsidiary less than 90 days; or

                  (ii)  such person is customarily employed by the Company or a
                        Subsidiary for 20 hours or less a week; or

                                                                               3
<PAGE>   4
                  (iii) such person is customarily employed by the Company or a
                        Subsidiary for not more than five months in any calendar
                        year;

                  (iv)  such person would, immediately upon enrollment, be
                        deemed to own, for purposes of Section 423(b)(3) of the
                        Code, an aggregate of five percent or more of the total
                        combined voting power or value of all outstanding shares
                        of all classes of the Stock of the Company or any
                        Subsidiary.

            Notwithstanding the above, solely for purposes of the first Offering
Period under the Plan, an employee who is employed by the Company or a
Subsidiary on the first day of such Offering Period and who is otherwise
eligible to participate in the Plan shall not be required to satisfy the 90 day
employment period specified in 5(a)(i) above.

            The Company will notify an employee of the date as of which he or
she is eligible to enroll in the Plan, and will make available to each eligible
employee the necessary enrollment forms. Notwithstanding the above, any
individual who is employed by the Company or a Subsidiary designated by the
Board and who is working outside of the United States shall not be eligible to
participate in the Plan if the laws of the country in which the employee is
working makes the offer of the Purchase Right or the delivery of Stock under the
Plan impractical. Additionally, the offer of the Purchase Right and the delivery
of Stock under the Plan shall be effective for any individual who is employed by
the Company or a Subsidiary and who is working outside of the United States only
after the Company has complied with the applicable laws of the country in which
the employee is working.

            (b)   Initial Enrollment. An employee who is eligible under Section
5(a) (or who will become eligible on or before a given Offering Period) may,
after receiving current information about the Plan, initially enroll in the Plan
by executing and filing with the Company a properly completed enrollment form,
including the employee's election as to the rate of payroll contributions for
the Offering Period. To be effective for any Offering Period, such enrollment
form must be filed at least two weeks (or such other period determined by the
Board) preceding such Offering Period.

            (c)   Automatic Re-enrollment for Subsequent Offering Periods. A
Participant whose enrollment in, and payroll contributions under, the Plan
continues throughout a Offering Period will automatically be re-enrolled in the
Plan for the next Offering Period unless (i) the Participant terminates
enrollment before the next Offering Period in accordance with Section 7(a), or
(ii) the Participant is ineligible to participate under Section 5(a). The
initial rate of payroll contributions for a Participant who is automatically
re-enrolled for a Offering Period will be the same as the rate of payroll
contribution in effect at the end of the preceding Offering Period, unless the
Participant files a new enrollment form designating a different rate of payroll
contributions and such new enrollment form is received no later than two weeks
(or such other period determined by the Board) prior to the beginning of the
next Offering Period.

            (d)   Payroll Contributions. A Participant will make contributions
under the Plan by means of payroll deductions from each payroll period which
ends during the Offering Period,

                                       4
<PAGE>   5
at the rate elected by the Participant in his or her enrollment form in effect
for that Offering Period (except that such rate may be changed during the
Offering Period to the extent permitted below). The rate of payroll
contributions elected by a Participant may not be less than one percent (1%) nor
more than ten percent (10%) of the Participant's Earnings for each payroll
period, and only whole percentages may be elected; provided, however, that the
Board may specify a lower minimum rate and higher maximum rate, subject to
Section 8(c). Notwithstanding the above, a Participant's payroll contributions
will be adjusted downward by the Company as necessary to ensure that the limit
on the amount of Stock purchased for an Offering Period set forth in Section
6(a)(iii) is not exceeded. A Participant may elect to increase, decrease, or
discontinue payroll contributions for a future Offering Period by filing a new
enrollment form designating a different rate of payroll contributions, which
form must be received at least two weeks (or such other period determined by the
Board) prior to the beginning of an Offering Period to be effective for that
Offering Period. In addition, a Participant may elect to discontinue payroll
contributions during an Offering Period by filing a new enrollment form, such
change to be effective for the next payroll after the Participant's new
enrollment form is received.

            (e)   Crediting Payroll Contributions to Cash Accounts. All payroll
contributions by a Participant under the Plan will be credited to a Cash Account
maintained by the Company on behalf of the Participant. The Company will credit
payroll contributions to each Participant's Cash Account as soon as practicable
after the contributions are withheld from the Participant's Earnings.

            (f)   No Interest on Cash Accounts. No interest will be credited or
paid on cash balances in Participant's Cash Accounts pending investment in
Stock.

      6.    PURCHASES OF STOCK

            (a)   Purchase Rights. Enrollment in the Plan for any Offering
Period by a Participant will constitute a grant by the Company of a Purchase
Right to such Participant for such Offering Period. Each Purchase Right will be
subject to the following terms:

                  (i)   The purchase price of each share of Stock purchased for
                        each Offering Period will equal 85% of the lesser of the
                        Fair Market Value of a share of Stock on the first day
                        of an Offering Period, or the Fair Market Value of a
                        share of Stock on the last day of an Offering Period.

                  (ii)  Except as limited in (iii) below, the number of shares
                        of Stock that may be purchased upon exercise of the
                        Purchase Right for a Offering Period will equal the
                        number of shares (including fractional shares) that can
                        be purchased at the purchase price specified in Section
                        6(a)(i) with the aggregate amount credited to the
                        Participant's Cash Account as of the last day of an
                        Offering Period.

                                                                               5
<PAGE>   6
                  (iii) The number of shares of Stock subject to a Participant's
                        Purchase Right for any Offering Period will not exceed
                        the lesser of: (1) 500 shares of Stock, or (2) the
                        number derived by dividing $6,250 by 100% of the Fair
                        Market Value of one share of Stock on the first day of
                        the Offering Period for the Offering Period.

                  (iv)  The Purchase Right will be automatically exercised on
                        the last day of the Offering Period.

                  (v)   Payments by a Participant for Stock purchased under a
                        Purchase Right will be made only through payroll
                        deduction in accordance with Section 5(d) and (e).

                  (vi)  The Purchase Right will expire on the earlier of the
                        last day of the Offering Period or the date on which the
                        Participant's enrollment in the Plan terminates.

            (b)   Purchase of Stock. At or as promptly as practicable after the
last day of an Offering Period, amounts credited to each Participant's Cash
Account will be applied by the Company to purchase Stock, in accordance with the
terms of the Plan. Shares of Stock will be purchased from the Company or in the
open market, as the Board determines. The Company will aggregate the amounts in
all Cash Accounts when purchasing Stock, and shares purchased will be allocated
to each Participant's Stock Account in proportion to the cash amounts withdrawn
from such Participant's Cash Account. After completing purchases for each
Offering Period (which will be completed in not more than 15 calendar days after
the last day of an Offering Period), all shares of Stock so purchased for a
Participant will be credited to the Participant's Stock Account.

            (c)   Dividend Reinvestment; Other Distributions. Cash dividends on
any Stock credited to a Participant's Stock Account will be automatically
reinvested in additional shares of Stock; such amounts will not be available in
the form of cash to Participants. The Company will aggregate all purchases of
Stock in connection with dividend reinvestment for a given dividend payment
date. Purchases of Stock for purposes of dividend reinvestment will be made as
promptly as practicable (but not more than 15 calendar days) after a dividend
payment date. The purchases will be made directly from the Company at 100% of
the Fair Market Value of a share of Stock on the dividend payment date or on the
open market. Any shares of Stock distributed as a dividend or distribution in
respect of shares of Stock or in connection with a split of the Stock credited
to a Participant's Stock Account will be credited to such Account.

            (d)   Withdrawals and Transfers. Shares of Stock may be withdrawn
from a Participant's Stock Account, in which case one or more certificates for
whole shares may be issued in the name of, and delivered to, the Participant,
with such Participant receiving cash in lieu of fractional shares based on the
Fair Market Value of a share of Stock on the day preceding the date of
withdrawal. Alternatively, whole shares of Stock may be withdrawn from a
Participant's Stock Account by means of a transfer to a broker-dealer or
financial institution that maintains an account for the Participant, together
with the transfer of cash in lieu of fractional

                                                                               6
<PAGE>   7
shares based on the Fair Market Value of a share of Stock on the day preceding
the date of withdrawal. Participants may not designate any other person to
receive shares of Stock withdrawn or transferred under the Plan. A Participant
seeking to withdraw or transfer shares of Stock must give instructions to the
Custodian in such manner and form as may be prescribed by the Custodian, which
instructions will be acted upon as promptly as practicable. Withdrawals and
transfers will be subject to any fees imposed in accordance with Section 8(a).

            (e)   Excess Account Balances. If any amounts remain in a Cash
Account following the date on which the Company purchases Stock for an Offering
Period as a result of the limitation set forth in Section 6(a)(iii) or for any
other reason, such amounts will be returned to the Participant as promptly as
practicable.

      7.    TERMINATION AND DISTRIBUTIONS.

            (a)   Termination of Enrollment. A Participant's enrollment in the
Plan will terminate upon (i) the beginning of any payroll period or Offering
Period that begins after he or she files a written notice of termination of
enrollment with the Company, provided that such Participant will continue to be
deemed to be enrolled with respect to any completed Offering Period for which
purchases have not been completed, (ii) such time as the Participant becomes
ineligible to participate under Section 5(a) of the Plan, or (iii) the
termination of the Participant's employment by the Company and its Subsidiaries.
An employee whose enrollment in the Plan terminates may again enroll in the Plan
as of any subsequent Offering Period that is at least 90 days after such
termination of enrollment if he or she satisfies the eligibility requirements of
Section 5(a) as of such Offering Period. A Participant's election to discontinue
payroll contributions will not constitute a termination of enrollment.

            (b)   Distribution. As soon as practicable after a Participant's
enrollment in the Plan terminates, amounts in the Participant's Cash Account
which resulted from payroll contributions will be repaid to the Participant. The
Custodian will continue to maintain the Participant's Stock Account for the
Participant until the earlier of such time as the Participant directs the sale
of all Stock in the Account, withdraws, or transfers all Stock in the Account,
or one year after the Participant ceases to be employed by the Company and its
Subsidiaries. If a Participant's termination of enrollment results from his or
her death, all amounts payable will be paid to his or her estate.

      8.    GENERAL.

            (a)   Costs. Costs and expenses incurred in the administration of
the Plan and maintenance of Accounts will be paid by the Company, to the extent
provided in this Section 8(a). Any brokerage fees and commissions for the
purchase of Stock under the Plan (including Stock purchased upon reinvestment of
dividends and distributions) will be paid by the Company, but any brokerage fees
and commissions for the sale of Stock under the Plan by a Participant will be
borne by such Participant. The rate at which such fees and commissions will be
charged to Participants will be determined by the Custodian or any broker-dealer
used by the Custodian (including an affiliate of the Custodian), and
communicated from time to time to Participants. In addition, the Custodian may
impose or pass through a reasonable fee for the withdrawal of Stock

                                                                               7
<PAGE>   8
in the form of stock certificates (as permitted under Section 6(d)), and
reasonable fees for other services unrelated to the purchase of Stock under the
Plan, to the extent approved in writing by the Company and communicated to
Participants.

            (b)   Statements to Participants. The Participant's statement will
reflect payroll contributions, purchases, sales, and withdrawals and transfers
of shares of Stock and other Plan transactions by appropriate adjustments to the
Participant's Accounts. The Custodian will, not less frequently than quarterly,
provide or cause to be provided a written statement to the Participant showing
the transactions in his or her Stock Account and the date thereof, the number of
shares of Stock credited or sold, the aggregate purchase price paid or sales
price received, the purchase or sales price per share, the brokerage fees and
commissions paid (if any), the total shares held for the Participant's Stock
Account (computed to at least three decimal places), and such other information
as agreed to by the Custodian and the Company.

            (c)   Compliance with Section 423. It is the intent of the Company
that this Plan comply in all respects with applicable requirements of Section
423 of the Code and regulations thereunder. Accordingly, if any provision of
this Plan does not comply with such requirements, such provision will be
construed or deemed amended to the extent necessary to conform to such
requirements.

      9.    GENERAL PROVISIONS.

            (a)   Compliance With Legal and Other Requirements. The Plan, the
granting and exercising of Purchase Rights hereunder, and the other obligations
of the Company and the Custodian under the Plan will be subject to all
applicable federal and state laws, rules, and regulations, and to such approvals
by any regulatory or governmental agency as may be required. The Company may, in
its discretion, postpone the issuance or delivery of Stock upon exercise of
Purchase Rights until completion of such registration or qualification of such
Stock or other required action under any federal or state law, rule, or
regulation, or the laws of any country in which employees of the Company and a
Subsidiary who are nonresident aliens and who are eligible to participate
reside, or other required action with respect to any automated quotation system
or stock exchange upon which the Stock or other Company securities are
designated or listed, or compliance with any other contractual obligation of the
Company, as the Company may consider appropriate. In addition, the Company may
require any Participant to make such representations and furnish such
information as it may consider appropriate in connection with the issuance or
delivery of Stock in compliance with applicable laws, rules, and regulations,
designation or listing requirements, or other contractual obligations.

            (b)   Limits on Encumbering Rights. No right or interest of a
Participant under the Plan, including any Purchase Right, may be pledged,
encumbered, or hypothecated to or in favor of any party, subject to any lien,
obligation, or liability of such Participant, or otherwise assigned,
transferred, or disposed of except pursuant to the laws of descent or
distribution, and any right of a Participant under the Plan will be exercisable
during the Participant's lifetime only by the Participant.

                                                                               8
<PAGE>   9
            (c)   No Right to Continued Employment. Neither the Plan nor any
action taken hereunder, including the grant of a Purchase Right, will be
construed as giving any employee the right to be retained in the employ of the
Company or any of its Subsidiaries, nor will it interfere in any way with the
right of the Company or any of its Subsidiaries to terminate any employee's
employment at any time.

            (d)   Taxes. The Company or any Subsidiary is authorized to withhold
from any payment to be made to a Participant, including any payroll and other
payments not related to the Plan, amounts of withholding and other taxes due in
connection with any transaction under the Plan, and a Participant's enrollment
in the Plan will be deemed to constitute his or her consent to such withholding.
In addition, Participants may be required to advise the Company of sales and
other dispositions of Stock acquired under the plan in order to permit the
Company to comply with tax laws and to claim any tax deductions to which the
Company may be entitled with respect to the Plan. This provision and other Plan
provisions do not set forth an explanation of the tax consequences to
Participants under the Plan. A brief summary of the tax consequences will be
included in disclosure documents to be separately furnished to Participants.

            (e)   Changes to the Plan. The Board may amend, alter, suspend,
discontinue, or terminate the Plan without the consent of shareholders or
Participants, except that any such action will be subject to the approval of the
Company's shareholders within one year after such Board action if such
shareholder approval is required by any federal or state law or regulation or
the rules of any automated quotation system or stock exchange on which the Stock
may then be quoted or listed, or if such shareholder approval is necessary in
order for the Plan to continue to meet the requirements of Section 423 of the
Code, and the Board may otherwise, in its discretion, determine to submit other
such actions to shareholders for approval. However, without the consent of an
affected Participant, no amendment, alteration, suspension, discontinuation, or
termination of the Plan may materially and adversely affect the rights of such
Participant with respect to outstanding Purchase Rights relating to any Offering
Period that has been completed prior to such Board action. The foregoing
notwithstanding, upon termination of the Plan the Board may (i) elect to
terminate all outstanding Purchase Rights at such time as the Board may
designate, and all amounts contributed to the Plan which remain in a
Participant's Cash Account will be returned to the Participant (without
interest) as promptly as practicable, or (ii) shorten the Offering Period to
such period determined by the Board and use amounts credited to a Participant
Cash Account to purchase Stock.

            (f)   No Rights to Participate; No Shareholder Rights. No
Participant or employee will have any claim to participate in the Plan with
respect to Offering Periods that have not commenced, and the Company will have
no obligation to continue the Plan. No Purchase Right will confer on any
Participant any of the rights of a shareholder of the Company unless and until
Stock is duly issued or transferred and delivered to the Participant (or
credited to the Participant's Stock Account).

            (g)   Fractional Shares. Unless otherwise determined by the Board,
purchases of Stock under the Plan executed by the Custodian may result in the
crediting of fractional shares of Stock to the Participant's Stock Account. Such
fractional shares will be computed to at least three decimal places. Fractional
shares will not, however, be issued by the Company, and

                                                                               9
<PAGE>   10
certificates representing fractional shares will not be delivered to
Participants under any circumstances.

            (h)   Plan Year. The Plan will operate on a plan year that begins on
January 1 and ends December 31 in each year.

            (i)   Governing Law. The validity, construction, and effect of the
Plan and any rules and regulations relating to the Plan will be determined in
accordance with the laws of the State of Arizona, without giving effect to
principles of conflicts of laws, and applicable federal law.

            (j)   Effective Date. The Plan will become effective on the IPO
Date, subject to the Plan being approved by shareholders of the Company, at a
meeting by a vote sufficient to meet the requirements of Section 423(b)(2) of
the Code. If the Plan is not approved in accordance with Section 423(b)(2) of
the Code, each Participant's Purchase Right shall be void and amounts credited
to the Participant's Cash Account shall be promptly returned to the Participant.

                                                                              10

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