In order to image the different sample regions and, in particular, to locate the contacted electrode, the sample was mapped over a range of 4 × 4 mm2 in steps of 100 μm using two different diffraction Bragg peaks as contrast signal for the maps. Fig. 1(b) and (c) displays scanning X-ray diffraction maps (SXDM) recorded using the Pt 111 and Au 111 Bragg peaks as contrast signal.