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The polarity sense of the non-centrosymmetric GaP crystal has rapidly been determined by use of an energy-dispersive diffractometer by choosing a suitable scattering angle, where the anomalous scattering is heavy, for example for the 333 and 
reflections in a pair of measurements. The main merits of this method are: (1) The necessary scaling is easily carried out by use of the intensity of even reflections observed simultaneously; (2) Unwanted fluorescence contributions can generally be separated. These make the conclusion more reliable. It was thus established that the less shiny surface is the Ga side when a 111 plate of GaP is treated by an etchant (HF:HNO3 = 5:1).
reflections in a pair of measurements. The main merits of this method are: (1) The necessary scaling is easily carried out by use of the intensity of even reflections observed simultaneously; (2) Unwanted fluorescence contributions can generally be separated. These make the conclusion more reliable. It was thus established that the less shiny surface is the Ga side when a 111 plate of GaP is treated by an etchant (HF:HNO3 = 5:1).
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