Contour maps of charge density (left) and its difference (right) for TiN/CrN multilayered coatings, taken along the () plane. The difference in charge density represents redistribution of charge in the interface relative to the isolated system. The interface is indicated by a horizontal line and atoms that intersect the contour plane are labeled. The upper scale denotes the magnitude of charge in the left panel and lower scale that in the right panel scale.