Symp At The 1989 Fall Meeting Of The Materials Research Soc : Impurities,Defects, And Diffusion In Semiconductors : Bulk And Layered Structures, Date: NOV 27-DEC 01, 1989, Location: BOSTON, MA, Sponsors: MAT RES SOC, USAF, OFF SCI RES, USN, OFF NAVAL RES, IBM, LAWRENCE BERKELEY LAB, N CAROLINA STATE UNIV