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The initial nucleation stage of surface reconstructions which appear during the crystallization of vacuum-deposited amorphous silicon (a-Si) overlayers on clean Si(111)-7x7 surfaces was investigated by scanning tunneling microscopy. When the initial a-Si coverage of less than ~4ML (monolayers) was annealed at 300 o C, the surface exhibited reordered adatoms. The adatom trimers were confined...
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