Interfacial thermal resistance

Interfacial thermal resistance is a measure of how well two materials conduct heat away from each other. Imagine a tall stack of ice cubes. On top of the ice cubes is a hot drink. The drink is trying to get heat away from it, but the ice cubes are trying to keep the heat in. The measure of how well the ice cubes are keeping the heat out of the drink is the interfacial thermal resistance. The lower the interfacial thermal resistance, the easier it is for the heat to pass from one material to the other.