Abstract
Nanostructures have become a major field in a material science. With molecular beam epitaxy it is possible to engineer multilayers with unusual anisotropic properties and metastable strucutres. For ultrathin films, or particles of small size, the coordination numbers or their ratios. We have calculated the effective coordination numbers N i , i=1 to 5 for thin films with different crystal structures. The thickness of the film is specified by the number of layers. Nz in the z-direction and the area in the xy plane by the number of rows of atoms along the side of a square domain. For fixed N z , with the x-ray beam unpolarized or its electric vector parallel or perpendicular to the substrate (xy plane), the effective N i approach hyperbolically for crystals from which the N i can be calculated for both N XY and N z ≥ 2. Comparison is made with the effective coordination numbers obtained from polarized EXAFS measurements on epitaxial metallic films less than 10 monolayers thick.
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