Friedels law and multiplicity factor

Earlier, we considered the effect of lattice symmetry on the multiplicity factors in powder diffraction only in terms of the number of completely overlapping equivalent Bragg peaks (section 2.10.3). Because Friedel s law is violated in non-centrosymmetric structures in the presence of anomalously scattering chemical elements, the evaluation of multiplicity factors should also include Eqs. 2.114 and 2.115. Thus, the multiplicity factor,maybe comprehensively defined as the number of equivalent reflections ihkT), which satisfy Eq. 2.114 in addition to having identical lengths of the 

Considering an orthorhombic crystal system, the equivalency relationships established above (section 2.10.3) also satisfy Eq. 2.1J4 i.e. 

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