The arrangement of coils within a multi-coil mat, determined from the measured field pattern. Each coil creates a distinct peak in the field. The positions of those peaks reveal where the coils sit inside the mat. The layout is described as a grid (for example, 3x2 at 100mm pitch) when coils are evenly spaced, or as irregular when they're not. Each coil's position is reported as an offset from the mat center.
A mat spreads many coils across a wide surface, and each coil lays down its own field footprint. How many coils there are is the coil count, how they are arranged is the coil layout, and the surface they cover together is the coverage area. When every coil peaks at about the same strength the coverage is uniform, and the field that spills from one coil into its neighbor is neighbor coupling.