Scanning tunneling microscopy and low-energy electron diffraction have been used to study the surface reconstructions of Ag on Si(001) as a function of the Ag coverage up to one monolayer (ML), and annealing temperatures above 450 ^∘{}C. Ag grows in the Stranski-Krastanov mode. An ordered 2×{}3 structure is observed in the first two-dimensional (2D) layer grown, and the 2D 2×{}3 layer is completed at 0.5 ML of Ag. Atomic-resolution images of this ordered surface structure are presented. Above 0.5-ML saturation coverage, an unusual growth transition from 2D to 3D is seen, which results from the subsurface accommodation of Ag accompanied by rearrangement of substrate Si.
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Lin et al. (1994) studied this question.
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