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We demonstrate that crystal truncation rod scattering can ideally be applied to extract detailed information on surface segregation profiles in multicomponent systems. We present an x-ray study of the surface segregation at Cu₃Au(001) at various temperatures above the order-disorder transition temperature. It exhibits a pronounced exponentially decaying, oscillatory behavior versus depth. The associated decay length Λ is found to obey Λ~t^-ν, with ν0ex0ex=0ex0ex0.49±0.04 and t0ex0ex=0ex0ex(T-TSP)/T, and, thus, is related to the bulk order parameter fluctuations and the bulk spinodal temperature TSP.
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Reichert et al. (1995) studied this question.
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