Growth protocol containing all relevant parameters (temperature substrates, evaporation temperature, geometry), without radical degradation. 2) Characterization of the electronic structure of the thin films at the interface. Chemi-versus physisorption. Core-hole screening effects. Distance of the molecules from the surface, mobility, desorption and dewetting phenomena. Density of states at the interface. 3) Correlation of the properties of the interfacial layer with the properties of the multilayer. 4) Assessing the (UHV, air, humidity, various gases) stability of the radical thin films. 5) Spinterface: Analysis of the magnetic character of the molecules at the interface. Spin density at the interface. Hybridisation. Correlation with the magnetic properties of the single molecule on the one side, and with the substrate on the other side, in the case of a magnetic substrate. Description of the influence of the substrate/multi-radicals on the pristine magnetic character of the molecule/substrate. Description of the influence of the substrate (chemi-versus physisorption) on the pristine magnetic character of the molecule. 6) In selected systems: Exploring the potential magnetic character of the thin films. Exploring the interplay between structure and the local magnetic-exchange coupling. Exploring the magnetic character for different thicknesses. Hysteresis curves.