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Figure 3
Coordinate systems in the discussion of the moiré phase, and graphical representation of components of [\Delta {\bf{g}}]. The two triangles in the left-hand side figure represent Borrmann fans for the incidence of the waves, [{{\bf{K}}_o}] and [{{\bf{K}}_g}]. In this diagram [\hat{\bf K}_o =[-\sin (\theta_{\rm B} +\alpha), 0, \cos (\theta_{\rm B} + \alpha)]] and [\hat{\bf K}_g =[\sin (\theta_{\rm B} -\alpha), 0, \cos (\theta_{\rm B} - \alpha)]].

ISSN: 2053-2733
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