In growth 2, the flakes are generally smaller and reach a size of 0.3-0.4 mm when the reflectivity measurement reaches the Kiessig minimum at αi = 2.05° (as the most important part of the XRR curve for the fitting) whereas for growth 3 the flakes are larger reaching 1 mm in size at the same scanning point. These figures are built accordingly to the method described by Konovalov et al. The horizontal axis is the position on the effective 1D detector. The vertical axis is the effective grazing angle. Color codes correspond to the absolute scattering intensity.