Figure 7
The coordinate axes [\xi_1^{o}], [\xi_2^{o}], [\xi_3^{o}] are aligned along directions of the first-nearest atoms to the atom at the origin A. The coordinate axes [xi]1, [xi]2, [xi]3 are along directions of the second-nearest atoms to the origin at A. The corresponding six atoms form the hexagon (indicated by dashed lines) of interatomic spacing [\hat{a}_0] = 31/2a0, where a0 is the interatomic distance between the first-nearest neighbors.  [article HTML]

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