NOVELTY - The layer has electrode coatings which are arranged on the surface to form anodes. Other electrode coatings are arranged on the other surface to form cathodes. One of the surfaces of third gas-impermeable region is adjacent to the other surface of the first and second gas-impermeable interface regions. Inter-connector and third gas-impermeable region electrically connect the anode of one fuel cell to the cathode of an adjacent fuel cell. The first and second gas-impermeable regions are configured to prevent transmission of laser beam used in processing catalyst layer.    USE - Planar fuel cell layer used in mobile device. Uses include but are not limited to mobile device such as cell phone, notebook-size personal computer, personal digital assistant (PDA), MPEG audio layer-3 player, digital camera, electronic dictionary and electronic book.    ADVANTAGE - The designability of the fuel cell layer can be improved, and the size of the fuel cell interconnect regions in planar array can be decreased. The gas leakage can be suppressed and the spacing between adjacent cells can be reduced. The fasteners can give pressure to the sealing elements, so that the sealing performance of the sealing element can be improved. The adhesiveness and gas seal performance can be improved, by applying nafion dispersion between the electrolyte membrane and the base material. The connection reliability between the third gas impermeable region and the conductor can be improved and the operation reliability of the fuel cell can be improved. The frequency of discontinuity of the catalyst layer on the opposite side of the gap and the frequency of hydrogen leakage due to laser burn-through can be reduced. The power generation effective area can be increased. The resistance when the catalyst coated membranes are electrically connected can be reduced.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for method for making fuel cell layer.    DESCRIPTION OF DRAWING(S) - The drawing shows an exploded perspective view of the fuel cell.    Composite membrane (12)    Substrate (14)    Anode catalyst layer (24)    Anode housing (40)    Cathode housing (42)