Abstract
Deposition of minute amounts of Rh on a clean and reconstructed Au{001} surface destroys the reconstruction and yields a 1\ifmmode\times\else\texttimes\fi{}1 structure. Prolonged deposition produces epitaxial but not pseudomorphic films of Rh with the bulk equilibrium fcc structure. Deposition of Rh on a clean Ag{001} surface produces overlayers which are partially covered by or intermixed with Ag, but which are pseudomorphic with the Ag{001} substrate. Photoemission experiments in the very early stages of overlayer growth reveals a 4.1\ifmmode\pm\else\textpm\fi{}0.3 eV splitting of the 4s levels of Rh, which is not observed in thick Rh films. The 4s splitting is explained by the presence of a magnetic moment on the Rh atoms and is related to recent theoretical predictions of ferromagnetism in a monolayer of Rh on either Ag{001} or Au{001}.
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