Figure 6.1: Schematic LEED patterns for Si{111}2*2-X and 2*1-X.

Figure 6.1: Schematic LEED patterns for Si{111}2*2-X and 2*1-X.
Frames a, b, and c are for three domains of Si{111}2*1-Ce.
Frame d is a composite of the above three frames.
Frame e is for Si{111}2*2-Ce; disregarding intensities, frames d and e cannot be distinguished.

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Figure 5.19: The experimental LEED spectra of Si{111}rt3*rt3-30-Au and Si{111}6*6-Au.
Figure 5.20,5.21: The experimental LEED I(V) spectra for the Si-rt3-Au and -Ag surfaces, and the calculated spectra for the Si-rt3-Ag HCT-model.
Figure 6.1: Schematic LEED patterns for Si{111}2*2-X and 2*1-X.
Figure 6.2: Schematic unit-cells (a,c) and LEED patterns (b,d) for the ThSiR_2 (a,b) and AlB_2 (c,d) polymorphs.