  Structural correlations at a liquid-solid interface were explored with
molecular dynamics simulations of a model aluminium system using the
Ercolessi-Adams potential and up to 4320 atoms. Substrate atoms were pinned to
their equilibrium crystalline positions while liquid atoms were free to move.
The density profile at the interface was investigated for different substrate
crystallographic orientations and temperatures. An exponential decay of the
density profile was observed, $\rho (z) \sim \rm{e}^{- \kappa z}$, leading to
the definition of $\kappa$ as a quantitative measure of the ordering at the
liquid solid interface. A direct correlation between the amount of ordering in
the liquid phase and the underlying substrate orientation was found.
