Additionally, we calculated the energy to separate two monolayers of Sc2C (i.e. binding energy). We obtained a value of 2.76 J/m 2 , which is larger than that of Y2C . Compared to other known layered electrides with similar structures (Ca2N and Sr2N), they exhibit a similar trend where the electride with the smaller cation, Ca2N, has a larger binding energy than Sr2N. This is likely due to the smaller cation electride having a smaller interlayer distance, giving a higher electrostatic attraction between the layers. The larger binding energy of the carbide systems overall is likely due to additional covalency, which is present in the nitride systems to a lesser degree.