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The texture function f(g) of a polycrystalline material may be split into two parts 
(g) and (g), where the first one contains the terms of even order l in the series expansion, whereas the second one consists of the odd-order terms. In the case of centrosymmetric crystals, or by virtue of Friedel's law in noncentrosymmetric crystals, the contribution of 
to experimental pole figures is identically zero. Hence it is impossible to determine from pole figures obtained by `normal' polycrystal diffraction experiments. It is suggested therefore that anomalous scattering of X-rays or neutrons should be used to determine from pole figure measurements directly and the corresponding formulae are given.
(g) and (g), where the first one contains the terms of even order l in the series expansion, whereas the second one consists of the odd-order terms. In the case of centrosymmetric crystals, or by virtue of Friedel's law in noncentrosymmetric crystals, the contribution of 
to experimental pole figures is identically zero. Hence it is impossible to determine from pole figures obtained by `normal' polycrystal diffraction experiments. It is suggested therefore that anomalous scattering of X-rays or neutrons should be used to determine from pole figure measurements directly and the corresponding formulae are given.
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