Abstract
The surface structure and composition of the (001)- and (111)-oriented surfaces of the ordered ${\mathrm{Pt}}_{3}$Sn alloy were determined by low-energy-electron-diffraction 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 \AA{}) for both the (001) and the (111) surfaces.
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