Abstract
The growth of silicon overlayers on both two-dimensional (2D) holmium silicide and hydrogen-terminated 2D holmium silicide grown on Si(111) has been investigated using scanning tunneling microscopy (STM). In the nonhydrogen-terminated case, the surface is heavily islanded, exhibiting the $7\ifmmode\times\else\texttimes\fi{}7$ and $2\ifmmode\times\else\texttimes\fi{}1$ silicon reconstructions. Growth on the hydrogen-terminated surface differs substantially, being better ordered and less heavily islanded. Growth mechanisms are proposed to explain these observed differences. STM data are also presented from the hydrogen-terminated 2D holmium silicide surface.
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