The Swiss Muon Source (SμS) has seven beamlines that scientists can use to investigate various aspects of modern physics. Some materials scientists use them for muon spin spectroscopy experiments. PSI is the only place in the world where a muon beam of sufficient intensity is available at a very low energy of only a few kiloelectron volts – thanks to the Muon Source’s high muon intensity and a special process. The resulting muons are slow enough to be used to analyse thin layers of material and surfaces. Six measuring stations (FLAME (from 2021), DOLLY, GPD, GPS, HAL-9500, and LEM) with instruments for a wide range of applications are available for such investigations.