Back Cover: A General Descriptor for Single‐Atom Catalysts with Axial Ligands (Angew. Chem. Int. Ed. 40/2024)

A general structure descriptor σ is constructed to quantify the structure–activity relationship of axial-coordination-ligand single-atom catalysts (ACL-SACs), as reported by Dapeng Cao, Xiao Cheng Zeng et al. in their Research Article (e202407812). The σ is solely based on a few key intrinsic features and can provide a simple and quick way to screen efficient electrocatalysts.