Controls if the physics 64-bit layers are used based upon PhysicsCoreSettings2D.physicsLayerNames or if not, the standard 32-bit layers based upon LayerMask. If a PhysicsCoreSettings2D asset is assigned then the physics layers (PhysicsCoreSettings2D.physicsLayerNames) will be used if PhysicsCoreSettings2D.usePhysicsLayers is also active. If no PhysicsCoreSettings2D asset is assigned then the global layers (See LayerMask) will be used.