Abstract
The ${\mathrm{Cu}}_{3}$Au(100) surface has been studied close to the bulk order-disorder transition temperature ${T}_{0}$ by x-ray diffraction under total external reflection. The order-parameter profile which has been probed in various depths is analyzed in terms of a surface-induced disorder transition. It is demonstrated that the temperature dependence of the superlattice intensity is consistent with the assumption of a disordered surface layer which exists between the ordered bulk and the vacuum at temperatures below ${T}_{0}$ and grows logarithmically as ${T}_{0}$ is approached.
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