Patent Number: 053848179
Section: claims

1. An x-ray reflective structure comprising a plurality of superposed layer pairs, a first member of each pair comprising a layer of boron nitride and a second member of each pair comprising a layer of a material selected from the group consisting of: nickel, chromium, vanadium, iron, manganese, cobalt and combinations thereof; said x-ray reflective structure having a d-spacing which is in the range of 10-200 angstroms. 2. An x-ray reflective structure as in claim 1 comprising at least 50 of said superposed layer pairs. 3. An x-ray reflective structure as in claim 1, wherein the d-spacing of said layer pairs is 55 angstroms. 4. An x-ray reflective structure as in claim 1, wherein the d-spacing of said layer pairs is 40 angstroms. 5. An x-ray reflective structure as in claim 1, wherein said second member of each pair comprises Nickel. 6. An x-ray reflective structure as in claim 1, wherein each layer pair includes a distinct compositional interface between said layer of boron nitride and said second member. 7. An x-ray reflective structure as in claim 6, wherein the surface roughness of each layer of boron nitride and each layer of said second member is approximately 5 angstroms rms. 8. An x-ray reflective structure as in claim 1, wherein each layer pair includes a graded compositional interface between said layer of boron nitride and said layer of nickel. 9. An x-ray reflective structure as in claim 8, wherein said graded compositional interface is sinusoidally graded. 10. An x-ray reflective structure as in claim 1, wherein said boron nitride layer comprises, on an atomic basis, 25-75% boron and 75-25% nitrogen. 11. An x-ray reflective structure as in claim 1, wherein said boron nitride layer includes, on an atomic basis, up to 10% of a material selected from the group consisting of: carbon, oxygen, calcium, and combinations thereof.