  The existed theories and methods for calculating interfacial thermal
conductance of solid-solid interface lead to diverse values that deviate from
experimental measurements. In this letter, We propose a model to estimate the
ITC at high temperature without comprehensive calculations, where the interface
between two dissimilar solids can be treated as an amorphous thin layer and the
coordination number density across interface becomes a key parameter. Our model
predicts that the ITCs of various interfaces at 300K are in a narrow range:
10$^{7}$W m$^{-2}$K$^{-1}$ $\sim $10$^{9}$ W m$^{-2}$ K$^{-1}$, which is in
good agreement with the experimental measurement.
