For comparison and because of higher resolution (less absorption at higher energies) and enhanced contrast variation [see tabulated atomic scattering factor f 0 of iodine (Gullikson 1995 (Gullikson -2008 ], in-house reflectivity experiments have been performed with the same sample composition as applied in synchrotron experiments. As the beam energy cannot be varied at in-house experimental stations, nonisomorphic samples, with respect to the iodine labels, were used for the home-built diffractometer. The in-house experimental station is a stationary H/2H diffractometer with a Seifert long fine focus X-ray tube holding a Cu anode (U = 35 kV, I = 40 mA) and a Cyberstar point detector. The X-ray beam is monochromatized and parallelized by a Göbel mirror selecting the Cu-K a line (E = 8.048 keV, k = 1.541 Å ). The primary beam intensity is on the order of 10 9 counts per second (cps). Automatized absorbers are used to avoid detector saturation for 2H close to zero and at first Bragg reflexes.