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Au-induced faceting on 4° vicinal Si(001) has been studied with in situ low energy electron microscopy and scanning tunneling microscopy; the surface decomposes into areas that are perfectly flat with a (001)-orientation and (119)-facets. Above a critical Au coverage extremely elongated (001) super-terraces propagate with a speed of crystallisation of up to 100μms −1 . The width and area of...
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