Figure 2.6: Reliability-factor (R_VHT, r_zj, and R_p) contour plots for the surface of Tb(11-20). The R-factor minima are indicated with solid squares. The results indicate a first interlayer-spacing contraction of roughly 0.15 Angstroms. Lateral shifting of the atoms, while still preserving the glide symmetry, is roughtly 0.2 Angstroms.

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