Patent Number: 
Section: claims

1. An x-ray mask tool for providing regions of reduced x-ray flux transmission, comprising: a silicon substrate having a thickness and substantially parallel first and second surfaces;  a first x-ray attenuating layer supported by said substrate and applied to said first surface, said first x-ray attenuating layer comprising a first image forming pattern comprising a plurality of openings, wherein each of said openings comprise an area; and  a second x-ray attenuating layer supported by said substrate and applied to said second surface, said second x-ray attenuating layer comprising a second image forming pattern, wherein some or all of said second x-ray attenuating layer eclipses some or all of said first x-ray attenuating layer and some or all of said areas. 2. The x-ray mask tool of  claim 1 , wherein said first and second x-ray attenuating layers comprise a metal layer. claim 1 3. The x-ray mask tool of  claim 2 , wherein said metal layer is selected from the group consisting of the, Transition series of metals listed in New IUPAC Group Numbers 4-12 of the Period Table of elements, aluminum, tin, and alloys thereof. claim 2 4. The x-ray mask tool of  claim 2 , wherein said metal layer consists essentially of a layer of gold. claim 2 5. The x-ray mask tool of  claim 2 , wherein said metal layers have a thickness such that a source of x-ray radiation is attenuated in intensity from about 50% to about 100%. claim 2 6. The x-ray mask tool of  claim 2 , wherein said metal layer is applied by a deposition process. claim 2 7. The x-ray mask tool of  claim 6 , wherein said metal deposit is deposited by electroless deposition. claim 6 8. The x-ray mask tool of  claim 6 , wherein said metal is deposited by a process selected from the list consisting of thermal or particle vapor deposition, chemical vapor deposition, sputter deposition, molecular beam epitaxy. claim 6 9. The x-ray mask tool of  claim 2 , wherein said metal layer is applied by a plating process. claim 2 10. The x-ray mask tool of  claim 9 , wherein said metal deposit is deposited by electroplating. claim 9 11. An x-ray mask tool for providing regions of reduced x-ray flux transmission, comprising: a silicon substrate having a thickness and substantially parallel first and second surfaces:  a first x-ray attenuating layer supported by said substrate and embedded into said substrate thickness, said first x-ray attenuating layer comprising a first image forming pattern comprising a plurality of openings, wherein each of said openings comprise an area, wherein said first image forming pattern is about flush with one of said first or second surface; and  a second x-ray attenuating layer supported by said substrate and applied to either of said first or second surfaces, said second x-ray attenuating layer comprising a second image forming pattern, wherein some or all of said second x-ray attenuating layer eclipses some or all of said first x-ray attenuating layer and some or all of said areas.