Miss board cut of a nonpolar III- nitride film grown on each phase, in order to suppress the surface wave, It is provided. The film surface morphology is improved to have a miss each cut toward the axial direction, including a- miss cut angle of less than 30 toward the direction of the cut angle and the a- axis misses than 0.15 toward the axial a- ; board, Ms. cut, morphology, a- axis, surface wave
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