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The surface structure and composition of the (001)and (111)-oriented surfaces of the ordered Pt3Sn alloy were determined by low-energy-electron-difraction intensity analysis. For both orientations the surface structure corresponds to a bulk truncation model. For the (001) surface, the mixed "PtSn" plane forms the outermost surface layer. Sn atoms in the outermost plane are also significantly upwardly displaced (by about 0.2 A) for both the (001) and the (111)surfaces.

The structure of cobalt layers grown on a Pd͕100͖ single-crystal surface has been studied by scanned angle x-ray photoelectron diffraction. At room temperature the cobalt layers grow in a structure related to the bulk cobalt fcc phase characterized by a large expansion of the in-plane lattice parameters and a corresponding contraction of the interlayer spacing ͑ϳ10%͒. This structure persists to coverages greater than 30-layer equivalents, and can be interpreted as a metastable body-centered-tetragonal ͑bct͒ phase. ͓S0163-1829͑96͒06339-4͔

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