Thermal transport capability of monolayer 2D materials has been under constant spotlight. However, different definitions of thickness in literature have led to ambiguity towards predicting thermal conductivity values and thus in understanding the heat transfer capability of different monolayer 2D materials. We argue that the same thickness should be used and a 'sheet thermal conductance' should be defined as an intensive 2D material property when characterizing the heat transfer capability of 2D materials. When converting literature thermal conductivity values of monolayer materials to this new property, some new features that were not displayed when using different thicknesses show up. (C) 2016 Elsevier B.V. All rights reserved.