Abstract
This error was made during the printing process. We sincerely apologize to the author, Dr. K. Sugiyama, for any inconvenience caused by the misprinting, and we must also apologize to Drs. K. Nakamura, M. Hikita, H. Asano and A. Terada for erroneously printing the title of their article and their names. We are now carrying out a thorough check of our printing system so as to prevent the possibility of any further errors of this kind. Dr. K. Sugiyama's paper is reprinted from Jpn. J. Appl. Phys. Vol. 21 (Part 1) No. 4 in the following pages, together with the corrected title and author's name.

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