The thermal conductivity of single crystal Rb2ZnCl4 has been measured
over the temperature range 0.03-300 K. Below 2 K, the thermal conducti
vity is that expected of a crystal. Above 20 K, the thermal conductivi
ty increases slowly with temperature and has a magnitude close to that
of amorphous solids. The results are compared with the thermal conduc
tivities of other disordered crystals.