Surfaces and interfaces show unique physical and chemical properties that largely differ from the bulk materials that they enclose. Likewise, thin films represent materials with one dimension confined to the nanoscale which drastically affects their behavior in comparison to the infinite 3D counterparts. X-ray diffraction and scattering techniques probe the structure of the topmost layers of a material and in this way provide the basis for understanding the remarkable characteristics of surfaces, interfaces, and thin films. With an emphasis on surfaces and interfaces, this workshop will present the activities of the research association Condensed Matter Physics and Chemistry (CMPC) at PETRA III and our collaborators from universities and research institutes. CMPC members include the teams of the PETRA III beamlines P02.1, P07-DESY, P08, P09, P21.1 as well as scientists and engineers from the technical infrastructure and sample environment groups. The workshop will focus on the following topics: - magnetic and superconducting thin films (session chair: Martin von Zimmermann) - epitaxial thin films and nanostructures (session chair: Florian Bertram) - polycrystalline and amorphous thin films (session chair: Ann-Christin Dippel) - soft matter thin films and liquid interfaces (session chair: Milena Lippmann) The workshop is open for everybody interested and will provide room for vivid discussions and exchange of ideas. Contributions to the poster session are very welcome.