4 layers

Boards in 1 GitHub repository, designed in KiCad, that use the STWLC38JRM by STMicroelectronics (WLCSP-40(2.126x3.327) Wireless Charge-Discharge ICs ROHS). See how each wires it, with its parts, size, README and files; the STWLC38JRM’s symbol, footprint and pinout are on its own page.
