The PHARAO facility is used for in-situ x-ray diffraction measurements to investigate epitaxial layers during molecular beam epitaxy (MBE) growth. It consists of the beamline, the diffractometer, and three plug-in MBE machines that can be swapped in and out of the diffractometer. Our beamline U125/2-KMC at BESSYII is located at the direct line of an U125 undulator source. It consists of a collimating mirror, a constant-exit Si(111) double-crystal monochromator (DCM), as an alternative a double multilayer monochromator (DMM) and a refocusing mirror. The DCM offers an energy range from about 5 to 15 keV with an energy resolution DE/E of around 2*10-4. The DMM has been added in 2008. It works at a fixed energy of 10 keV with an energy resolution around 1%, thereby offering an about 50 times higher primary beam intensity.