Man pages matching name xray::scattering::cromermann in section 3pm:

Xray::Scattering::CromerMann.3pm.en	debian 10 / libxray-scattering-perl
Xray::Scattering::CromerMann.3pm.en	debian 11 / libxray-scattering-perl
Xray::Scattering::CromerMann.3pm.en	debian 12 / libxray-scattering-perl