X-ray diffraction profile broadening and stacking faults

I read with great interest L. Velterop's paper "X-ray diffraction analysis of stacking and twin faults...", J. Appl. Cryst. (2000), 33,
296. I then tried to reproduce the calculation of the profiles. With (1,1,1) faults, how do you manage with (non affected) lines such
as (-2,2,0) for which L0 = 0, in that case formulae (17) and (18) are
no longer valid? Thank you. Posted at: http://www.groupsrv.com
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