Hydrogen Lyα is our primary emission-line window into high redshift galaxies. Surprisingly,
despite an extensive literature, Lyα radiative transfer in the most realistic case of a dusty,
multi-phase medium has not received detailed theoretical attention. We investigate Lyα
resonant scattering through an ensemble of dusty, moving, optically thick gas clumps. We
treat each clump as a scattering particle and use Monte-Carlo simulations of surface
scattering to quantify continuum and Lyα surface scattering angles, absorption probabilities …