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The surface of a polycrystalline Pd-substrate covered with (sub-) monolayers of Ni was investigated with Positron-annihilation induced Auger Electron Spectroscopy (PAES). Comparative studies using conventional AES induced by electrons and X-rays showed the outstanding surface sensitivity of PAES. Time-dependent PAES was performed on a 0.5ML Ni cover layer on Pd and compared with conventional X-ray...