title: The Ewald dynamical diffraction theory--ninety years later.
abstract: Diffraction on a crystalline slab formed by point-like scattering centres is treated as a multiple scattering problem based on the Ewald equations. Using general results expressed in a lucid matrix form, the two-beam solution for both coplanar and non-coplanar cases valid near and far from Bragg peaks is found and a detailed comparison of the final formulae obtained with those following from Laue's theory is performed.
authors.affiliation: Institute of Physical Engineering, Brno University of Technology, 616 69 Brno, Technická 2, Czech Republic. dub@ufi.fme.vutbr.cz
authors.forename: P
authors.initials: P
authors.lastname: Dub
authors.forename: O
authors.initials: O
authors.lastname: Litzman