Abstract
We have performed a surface X-ray diffraction study of submonolayer √3 structures of Sn and Pb on Ge(111). The structure factor analysis of fractional-order Bragg reflections shows a significant relaxation in the Ge substrate induced by the Sn/Pb adatoms. The registry of the adatoms is determined from the analysis of the integer-order intensities. The adatoms are situated on top of the second layer of Ge atoms. The intensity profile normal to the surface of a subset of the fractional-order Bragg rods were measured. They display a pronounced intensity variation for both Sn and Pb, which can be explained only by a subsurface relaxation extending at least four atomic layers into the bulk.
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