Exhibit 31.2

AMTECH SYSTEMS, INC. AND ITS
SUBSIDIARIESCERTIFICATION PURSUANT TO RULE 13a-14(a)/15d-14(a)OF THE
SECURITIES EXCHANGE ACT OF 1934, AS AMENDED

I, Bradley C. Anderson, certify that:

1. I have reviewed this Annual Report
on Form 10-K of Amtech Systems, Inc. (the registrant),

2. Based on my knowledge, this report
does not contain any untrue statement of a material fact or omit to state a
material fact necessary to make the statements made, in light of the
circumstances under which such statements were made, not misleading with respect
to the period covered by this report;

3. Based on my knowledge, the financial
statements, and other financial information included in this report, fairly
present in all material respects the financial position, results of operations
and cash flows of the registrant as of, and for, the periods presented in this
report;

4. The registrants other certifying
officer and I are responsible for establishing and maintaining disclosure
controls and procedures (as defined in Exchange Act Rules 13a-15(e) and
15d-15(e)) for the registrant and we have:

(a) Designed
such disclosure controls and procedures, or caused such disclosure controls and
procedures to be designed under our supervision, to ensure that material
information relating to the registrant, including its consolidated subsidiaries,
is made known to us by others within those entities, particularly during the
period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused
such internal control over financial reporting to be designed under our
supervision, to provide reasonable assurance regarding the reliability of
financial reporting and the preparation of financial statements for external
purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrants disclosure controls
and procedures and presented in this report our conclusions about the
effectiveness of the disclosure controls and procedures, as of the end of the
period covered by this report based on such evaluation; and

(c) Disclosed in this report any change in the registrants internal
control over financial reporting that occurred during the registrants most
recent fiscal quarter (the registrants fourth fiscal quarter in the case of an
annual report) that has materially affected, or is reasonably likely to
materially affect, the registrants internal control over financial reporting;
and

5. The registrants other certifying
officer and I have disclosed, based on our most recent evaluation of internal
control over financial reporting, to the registrants auditors and the audit
committee of registrants board of directors (or persons performing the
equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or
operation of internal control over financial reporting which are reasonably
likely to adversely affect the registrants ability to record, process,
summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other
employees who have a significant role in the registrants internal control over
financial reporting.

| | By | /s/ Bradley
      C. Anderson                              |  | 
| | -- | ---------------------------------------------------------- |  | 
| |    | Bradley C. Anderson                                       
| |    | Vice President 
      Finance and Chief Financial Officer | 
| |    | Amtech
      Systems, Inc.                                
| |    | Date:
      December 10, 2008                             

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