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+Description: anisotropic peak broadening
+We based this expression for anisotropic peak broadening caused by antiphase boundaries on work by Her, Stephens et al (//Acta Cryst. B// **63** 561 (2007)). We found it useful for fitting magnetic Bragg peaks in layered materials with much shorter magnetic correlation lengths along //c// than in the //ab// plane (//Phys. Rev. B// **89** 100402(R) (2014); //Phys Rev. B//, in press).
+Expression for constant wavelength data:
+      lor_fwhm = C_star*((L^2)^0.5)*D_spacing  Lam / (Pi*xi_z Cos(Th)) Rad;
+      prm xi_z  47.53024`_3.31957 min 0 max 1000
+Expression for time-of-flight data:
+      lor_fwhm = C_star*((L^2)^0.5)*D_spacing * difc_n58 * (D_spacing^2) / (Pi*xi_z ) ;
+      prm xi_z  86.31282`_1.33195 min 0 max 1000
+where xi_z is the correlation length along z.