Spin-orbit coupling in the electronic states of solution-processed hybrid metal halide perovskites forms complex spin-textures in the band structures and allows for optical manipulation of the excited state spin-polarizations. Here, we report that motional narrowing acts on the photoexcited spin-polarization in CH(3)NH(3)PbBr(3) thin films, which are doped at percentage-level with Mn^(2+) ions. Using ultrafast circularly polarized broadband transient absorption spectroscopy at …