  We numerically study the non-local transport signature in Weyl semimetal as a
test for interconnectedness of the surface states, using a recursive Green's
function method. We drive a current using two leads connected on the same
surface (top surface) and apply a magnetic field throughout the system,
perpendicular to the surface. We find that this results in a current flowing on
the other surface in the direction opposite to the direction of the current on
the top surface and we comment on the viability of observing such an effect in
experiment. The recursive Green's function method we employ is exact and
provides us with the Green's functions of the two surfaces as well as their
connecting elements, which can be applied also for other numerical simulations
where the effect of surface to surface transport is important.
