In this work, we introduce a new descriptor for predicting synthesizability by focusing on thermodynamic stability. Such a metric has precedent when describing inorganic crystalline materials, namely their energy above the convex hull (E hull ). The energy above the convex hull is the difference between the Density Functional Theory (DFT) calculated formation energy of a material and its most energetically stable combination of decomposition products (i.e., the convex hull), and low E hull is generally regarded as a necessary condition for an inorganic crystalline material to be synthesizable. Decomposition products can either be a compositionally-constrained linear combination of other materials (e.g., 2 A 2 B + 1 2 B for composition AB) or another material with the same composition but different crystal structure, called "polymorphs".