H. L.  Meyerheim, Ernst, A., Mohseni, K., Tusche, C., Adeagbo, W. A., Maznichenko, I. V., Hergert, W., Castro, G. R., Rubio-Zuazo, J., Morgante, A., Jedrecy, N., Mertig, I., and Kirschner, J., ?Wurtzite structure in ultrathin ZnO films on Fe(110): Surface x-ray diffraction and ab initio calculations?, Physical review. B, Condensed matter and materials physics, vol. 90, 2014.