A method of forming a polyolefin catalyst component includes halogenating metal complexes. The high-voltage coil for transmitting acoustic wave of the present invention is particularly suitable for cast resin transformers. In these constructions, a first tier of reflection is provided when light is reflected at the surface of a low index optical film which is disposed directly or indirectly on a light guide. Vertical GaN-based light emitting devices may then be formed by cutting the semiconductor structure.