Other computational studies predicted room-temperature κ latt of 5.15 and 2.54/0.86 W m -1 K -1 for π SnS and SnSe using the Slack model, but the larger predictions suggest this model is likely not appropriate for these systems. On the other hand, Ref. predicted κ latt of 0.49 and 0.32 W m -1 K -1 for π SnS and SnSe using the Cahill model for the minimum thermal conductivity, which are remakably similar to the present calculations.