Abstract
The profiles of LEED sports from Si (001) vicinal surfaces were analysed on a lens shaped sample. Steps have been studied 4.3 0 off (001) with the step direction varying by ±10 0 around the [1 1 0] zone. It is shown that the direction of the lateral displacement of the dimer rows across double layer steps is not random but correlated with the direction of kinks in the steps. Comparison with model calculations gave evidence that even on surfaces with a mean edge direction of (1 1 0), the dimer row displacement is not random. We attribute this to kinked regions due to microscopic roughness.
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