While it may seem strange for the interface permittivity to be larger than the inclusion permittivity, this is an artifact of representing discrete atomic layers as a continuum. With the selected thickness of 1.0 Å and inner radius of 3.27 Å, the interface contains 24 atoms and an atomic density of 0.134 atoms/ Å3 . The inclusion, however, contains only eight silver atoms 1 Symbols ∥ and ⊥ indicate whether the inclusion has its long axis oriented parallel to the applied field and perpendicular to it, respectively. The field is oriented along z in each case, thus the ∥ notation indicates that the rod or disk long axis was along z, whereas the ⊥ notation indicates that the long axis was in the xy plane. τ is the permittivity error defined in Eq. 8.