The people who established the spin-wave theory and tech... Sorry, Suhl works are generally on nonlinearity, so I should not have to mention him here. I tried remembering where have I seen the 45deg cut film guide for the first time. That was an overview on filters and signal enhancers from around early 70's; but I could not find it in my library, and made a wild guess.nBy Adam do you mean J. D. Adam? By Damon, you referring to R. W. Damon, who is credited (along with J. R. Eshbach) for the theory behind surface spin waves? Again, complete names would be helpful.nYou mean, you have checked, or is it your guess? That is my guess as well... but my experience tells me, you should try doing that first to be sure.nI checked.nn