The theoretical study on monolayer Bi2SeTe2 with the same structural ordering in Ref. reports a 𝜅 latt of 1.96 W m -1 K -1 , which is 23 % lower than our calculated in-plane value. The similar theoretical studies in Ref. report room-temperature thermal conductivities of 3.92 and 1.35 W m -1 K -1 , depending on whether or not spin-orbit coupling (SOC) is included in the calculations, and our value falls between these two extremes. (We note in passing, however, that the large effect of SOC suggested by the latter study is somewhat surprising, especially given the small effect on the phonon dispersion.)