The X-ray measurements were performed at the ID03 beamline of ESRF in Grenoble. The 24 keV X-ray beam was focused to a size of 300 µm × 50 µm (horizontal×vertical relative to the plane of the sample surface) at the sample position. The incidence angle of the beam was set to 0.3°relative to the surface plane. The data were collected with a 2D Maxipix detector and analyzed as described in Ref. 95