The arrangement of coils inside a multi-coil mat: where each coil sits and how large it is. It shows which parts of the mat carry the field. The scan grid is planned around it, so the closest readings fall over each coil. When the coils have been mapped with Coil Discovery, the layout comes from that mapping. Otherwise it's read from where each coil's field peaks in the scan. Each coil's position is given as an offset from the mat's center, and an evenly spaced layout is described as a grid (for example, 3x2 at 100 mm pitch). When the manufacturer supplies a layout, it's recorded as the documented layout and compared with the measured one.
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.
