Figure 4.7 Top: The superposition of schematic 1*1 (closed circles) and Si{111}(2/3)rt3*(2/3)rt3-30-Mg (open circles) LEED patterns.
Bottom: Schematic top-view of the Si{111} surface. The large and small circles are first and second layer atoms.
The reciprocal and real unit-meshes are indicated.

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