Measurement System (PPMS). Heat capacity measurements were performed on a small fragment of dense pellet, with mass 0.0125 g, of CuBiSeCl2 using the Heat Capacity Option (HCO) on the PPMS. The sample was mounted using N grease. An addenda measurement was performed on the sample holder and grease prior to mounting and measuring the pellet fragment. Both the addenda and pellet fragment measurements were performed between 2 and 300 K.