We studied a SrTiO3 bicrystal with X-ray diffraction. It was prepared by fusing two iron doped crystals, with 18.4 degrees miscut from the (001) direction along the  azimuth, at elevated pressure and temperature. This miscut corresponds to a (103) orientation of the interface and surface. One of the crystals has been polished to a thickness of 10 mu m to make the interface accessible to the synchrotron X-ray beams. Crystal truncation rod scattering was used to study the structure of the interface. Our results show a very narrow interface region with a thickness of about 11 Angstrom and a significantly changed atomic structure.