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PACS. 68.35Fx -Diffusion; interface formation. PACS. 66.30Dn -Theory of diffusion and ionic conduction in solids. PACS. 81.15Hi -Molecular, atomic, ion, and chemical beam epitaxy. Abstract. -The diffusion of an extra-adatom on reconstructed Si(111) surfaces is investigated using density-functional total-energy pseudopotential calculations. The diffusion path is characterized by a basin of attraction in which the extra-adatom is localized until an intermittent jump to a nearby basin ofdoi:10.1209/epl/i1997-00349-x fatcat:mrdang5pdrb5hi53qowkerfjxe