  We study odd-parity nematic superconductivity in doped topological insulators
in presence of surface magnetic impurities. The peculiar surface subgap
spectrum, characterized by a Majorana flatband, nodal cones and the surface
states of the parent topological insulator, gives rise to an overall
ferromagnetic RKKY interactions between the surface impurities. An additional
coupling between the impurities and a preemptive chiral order parameter promote
a surface time-reversal symmetry breaking solution at the surface of the
system. We discuss the relevant scenarios and suggest to engineer surface
chiral superconductivity by properly choosing magnetic adatoms with highly
anisotropic exchange coupling.
