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We have used high-resolution LEED and AES on a spherically shaped sample to investigate the polar and azimuthal dependence of the step topography of Si(001) vicinals and its change by As, Sb and Bi adsorption. The well-established smooth transition on clean Si from single (S) to double (D) layer steps between 1.5 o and 6 o in the [110] azimuth is completely changed. After deposition...
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