Coordinates of atoms in the first and second layers of Si(111) 2×{}1 have been determined which yield surface energy bands in good agreement with experiment. Two surface resonances in angular photoemission data previously assigned to dangling-bond surface states are identified as arising from the maximum in the lower dangling-bond band and from a saddle point in the upper back-bonding band.
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Pandey et al. (1975) studied this question.
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