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• Figure 4.1: The T_4^2 model for Si{111}rt3*rt3-30-Mg. The Mg atoms form a close-packed layer centered on T_4 sites.
• Figure 4.2: The H_3^2 model for Ge{111}rt3*rt3-30-Pb.
• Figure 4.3: The T_1^2 model for Si{111}rt3*rt3-30-Pb.
• Figure 4.4: The H_3-T_4 model for Si{111}rt3*rt3-30-Au.
• Figure 4.5: The H_3-T_1 model for Si{111}rt3*rt3-30-Bi, -Sb, and -Au.
• Figure 4.6: The T_4-T_1 model for Si{111}rt3*rt3-30-Bi, -Sb, and -Au.
• 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 fist and second layer atoms. The reciprocal and real unit-meshes are indicated.
• Figure 4.8: Schematic LEED patterns for Si{111}3*3-Mg and 3*1-Mg.
  
• Figure 4.9 and 4.10: The I(V) spectra of Si{111}3*1-Ag, -Li, -Na, and -Mg.