The three layers structure, the metallic layer as the solar control film, the compoud layer of transition metals as the protective layer and the oxide layer to creat reflective colour, is needed to form a perfect solar control coating. 指出了为实现阳光控制作用所必需的三层膜结构&控制阳光的金属膜、保护作用的化合物膜和反射调色作用的氧化物膜。