  Weyl semimetals are known to host massless surface states called Fermi arcs.
These Fermi arcs are the manifestation of the bulk-edge correspondence in
topological matter and thus are analogous to the topological chiral surface
states of topological insulators. It has been shown that the latter, depending
on the smoothness of the surface, host massive Volkov-Pankratov(VP) states that
coexist with the chiral ones. Here, we investigate these VP states in the
framework of Weyl semimetals, namely their density of states and
magneto-optical response. We find the selection rules corresponding to optical
transitions which lead to anisotropic responses to external fields. In the
presence of a magnetic field parallel to the interface, the selection rules and
hence the poles of the response functions are mixed.
