$\kappa$	thermal conductivity
$r_c$	cutoff radius
NN	nearest neighbor
$\hslash$	reduced Planck constant
$\mathsf{\omega }$	phonon frequency
$k_B$	Boltzmann constant
T	temperature
$\mathsf{\Omega }$	system volume
$f_0$	equilibrium Bose–Einstein distribution
$\upsilon$	phonon group velocity
${\tau }_{\lambda }^0$	phonon lifetime
$C\left(\omega \right)$	mode specific heat
$\alpha , \beta$	Cartesian coordinate directions
m	atomic mass
i, j, k	atomic indices
${\kappa }_{\mathrm{I}}$	thermal conductivities from the iterative solution
${\kappa }_{\mathrm{RTA}}$	thermal conductivities from the relaxation time approximation
${\mathsf{\Gamma }}_{\mathrm{N}}$	normal scattering rates
${\mathsf{\Gamma }}_{\mathrm{U}}$	Umklapp scattering rates
${\overline{\mathsf{\Gamma }}}_{\mathrm{N}}$	averaged normal scattering rates
${\overline{\mathsf{\Gamma }}}_{\mathrm{U}}$	averaged Umklapp scattering rates