Abstract
A combined optical, SEM and STM study of growth spirals on the richly polytypic CdI 2 crystals has yielded some novel results. The STM photographs directly reveal the atomic arrangement in the unit cell, in exact conformation with the known structural data. The STM has also enabled an accurate measurement of the interstep spacings, which are all found to be an integral multiple of the unit cell a-dimension. The interstep spacing is found to be variable for steps of the same height, which apparently arise from differences in supersaturation during crystal growth.
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