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Isolated adsorption of single-Sn atoms occurs equally on the faulted and unfaulted halves of the Si(111)-(7x7) surface at low coverage. These single-Sn atoms are mobile among the three center Si adatoms, but they do not diffuse out from the adsorbed half unit cells at room temperature. These single-Sn atoms are responsible for the noisy triangular feature of the STM image. When the faulted and unfaulted...
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