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A theoretical investigation of diffraction in a rectangular t\times l crystal for nonsymmetrical coplanar scattering has been undertaken. The asymmetry in the scattering geometry, measured by an angle \gamma, causes different weights for the mixed Laue-Bragg contributions to the integrated power. Primary extinction and ordinary absorption are only moderately affected when the value of the geometrical parameter \zeta = (t/l)\tan\theta_{oh} \,\lt\, 1, \theta_{oh} being the Bragg angle. For increasing values of \zeta and \gamma the surface integration set-up for the Laue and Bragg regions is extensively changed, leading to pronounced effects. Analytical results for the normal absorption factor are presented.
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