A communication system and method to allow authorized access to a vehicle. The controller generates a switching signal to switch a transformer for providing an output voltage and an output current. The process uses excess toluene, with the reaction rate being controlled to maintain a residual of 0. Next, the width of the photo-resist layer is added to be as an ion-implanted mask. The recess extends from an end wall along the center of the length of the brick sufficiently far so that the brick can be stacked upon other bricks of like construction. Aluminium hydroxo complexes containing polycations with 13 or 30 aluminium atoms are preferred.