Sodium-Doped LaMnO 3 Thin Films: Influence of Substrate and Thickness on Physical Properties. -Optimally doped La0.85Na0.15MnO3 thin films are deposited on SrTiO3(100), NdGaO3(100), and NdGaO3(110) single crystals by rf-magnetron sputtering with various thicknesses ranging from 11 to 82 nm. The samples are characterized by XRD, AFM, resistance measurements, EPR, and magnetization measurements on the films grown on SrTiO 3 . The smooth films display magnetoresistance values greater than 70% near room temperature. -(MALAVASI*, L.; MOZZATI, M. C.; ALESSANDRI, I.; DEPERO, L. E.; AZZONI, C. B.; FLOR, G.; J.