Abstract
Part of this study was supported by the Austrian Fonds zur Föderung der wissenschaftlichen Forschung FWF (P20709-N20) and the Austrian COMET Competence Centre Program. Additionally, the authors highly appreciate the expertise of the beamline staff of HARWI II which contributed greatly to the success of the experiments. The support of the DESY User Office and management is gratefully acknowledged. Research activities leading to the presented HEXRD results received funding from the European Community's Seventh Framework Program (FP7/2007–2013) under Grant Agreement no.8226716. Finally, we thank Prof. F. D. Fischer for fruitful discussions and T. Lippmann and J. Thomas for expert technical assistance.