Hi, Fracois,
Take a look in the book "Powder diffraction, Theory and practice" edited
by Dinnebier and Billinge, published by The Royal Society of Chemistry,
2008. In chapter 12, page 347 you can find the texture strength for
spherical harmonics - formula (52). You have only to add a factor 1/4 in
front of {...} (a corrigenda to the original paper was published last year
in JAC) and to identify the fitting SH parameters "alpha, ..., delta" with
your actual parameters by comparing the pole distribution formula in the
program you are using with (36) to (39) from this chapter (changing 4 into
2 in (36))
Best wishes
Nicolae Popa
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