J. Appl. Cryst. (1994). 27, 195-197 [ doi:10.1107/S0021889893011057 ]
Abstract: Corrections are presented to the angle calculations in surface diffraction [Mochrie (1988). J. Appl. Cryst. 21, 1-3] based on
rotation for four-circle diffractometers (Philips PW1100, Seifert XRD3000-S).
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