  We present a theoretical study of the phase-coherent DC conductivity of
few-layered antimonene in the presence of surface disorder. It is well known
that while a single layer is a trivial semiconductor, multiple layers
(typically a minimum of $\approx$ 7) turn into a semi-metal with a nontrivial
topological invariant featuring protected and decoupled surface states. We
employ the finite-size Kubo formalism based on density functional theory
calculations to show that the conductivity is amply dominated by the
topological surface states even without bulk disorder. More importantly, the
conductivity of the surface states does not show traces of a metal-insulator
transition while the bulk ones can be driven towards an insulating phase in
presence of only surface disorder. These results suggest that few-layered
antimonene, despite not being insulating in the bulk, can present many of the
advantages attributed to topological insulators under very general experimental
conditions.
