In GIXRD measurement the incident angle onto the film surface is very low, so it corresponds to a large footprint of the incident beam as well. So, what should be the ideal dimension of the film surface i.e length and width, such that the beam does not fall outside the film surface.
Stefan Ručman
Size as area is not so important as much thickness and scaning speed. you can have 1mm2 and still obtain prety good results. Most of mine thin films never cover whole substrate.
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