//! DFT-D4 Dispersion Correction — Core Module
//!
//! Geometry-dependent London dispersion with Becke-Johnson damping.
//! Provides C6/C8 two-body and optional ATM three-body corrections.
//!
//! ## Relationship to other methods
//!
//! - **HF-3c**: Uses D3-BJ internally; D4 is the next-generation replacement
//! - **PM3**: Can be augmented with D4 for non-covalent interactions
//! - **xTB**: GFN-xTB includes D4 natively; standalone D4 useful for EHT-D4
//! - **UFF/MMFF94**: D4 improves long-range dispersion accuracy
//!
//! ## Reference
//!
//! Caldeweyher, Ehlert, Hansen, Bauer, Spicher, Grimme,
//! J. Chem. Phys. 150, 154122 (2019).
pub use ;
pub use ;