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We carried out STM observations of Si(5 5 12) surfaces. STM images showed that the surface has a long period of about 5 nm along the 665 direction that coincides with a period of the bulk terminated structure, and a period of about 0.7 nm along the 110 direction that coincides with a 2-fold period of the bulk terminated structure; the 2 1 structure. The long period along the 665 direction...
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