  We examine how conformal boundaries encode energy transport coefficients --
namely transmission and reflection probabilities -- of corresponding conformal
interfaces in symmetric orbifold theories. These constitute a large class of
irrational theories and are closely related to holographic setups. Our central
goal is to compare such coefficients at the orbifold point (a field theory
calculation) against their values when the orbifold is highly deformed (a
gravity calculation) -- an approach akin to past AdS/CFT-guided comparisons of
physical quantities at strong versus weak coupling. At the orbifold point, we
find that the (weighted-average) transport coefficients are simply averages of
coefficients in the underlying seed theory. We then focus on the symmetric
orbifold of the $\mathbb{T}^4$ sigma model interface CFT dual to type IIB
supergravity on the 3d Janus solution. We compare the holographic transmission
coefficient, which was found by [1], to that of the orbifold point. We find
that the profile of the transmission coefficient substantially increases with
the coupling, in contrast to boundary entropy. We also present some related
ideas about twisted-sector data encoded by boundary states.
