In all cases, the calculated interfacial thermal conductance for the nanospheres represents a very large jump (2.5 × -4.1×) relative to the planar 111 interface. The nanospheres have a large population of undercoordinated surface metal sites when compared with the planar 111 surface, and this may explain part of the increase in G. However, there is an additional large increase in conductance when polarizability is introduced, so the role that this plays is still an interesting question. In the next section we explore the role that metal polarizability plays on enhancing the low frequency heat-carrying vibrational modes that are experienced by surface molecules on either side of the interface.