Abstract
We present X-ray photoelectron diffraction (XPD) data from AuCu3(001) at 293 and 823 K. i.e. below and above the well known order-disorder transition of the bulk. Azimuthal XPD data of Au4f and Cu 3p show a rather weak dependence on temperature. They are compared with layer-type multiple scattering calculations and it is concluded that the first two layers do not mix up to 823 K. In agreement with other authors the ordered alloy is found to have 50% Au and 50% Cu in the first layer while the second layer contains 100% Cu.
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