Dear Sir. Concerning your issue about the sample preparation procedure for 2D-GIXRD spectrum analysis. An ideal powder sample should have many crystallites in random

orientations, the distribution of orientations should be smooth and equally distributed

amongst all orientations. Large crystallite sizes and non-random crystallite orientations both lead to peak intensity variation, the measured diffraction pattern will not agree with that expected from an ideal powder. If the crystallites in a sample are very large, there will not be a smooth distribution of crystal orientations. Crystallites should be