Thermal resistance of material between armour layers

Thermal resistance of the separation material between the first and second armour layer.

Symbol
$T_{2_{2}}$
Unit
K.m/W
Formulae
$\frac{\rho_{ab_{2}} \ln{\left(1 + \frac{2 t_{ab_{2}}}{D_{a_{1}}} \right)}}{2 \pi}$
Related
$D_{a_{1}}$