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Published online by Cambridge University Press: 28 February 2011
Part of the work described below was delivered as an invited talk by one of us (A.K.) at the special symposium to honour Dr. Ben Abeles for his 65th birthday. During the questions part of my talk, I was asked by Ben Abeles: ‘what about magnetoresistance…’. I answered that this is a complicated issue and I don't have time to discuss this matter. After my talk Ben explained that he always asks this question because his thesis was on magnetoresistance measurements. I remembered this question and decided that this paper would be an excellent place give to the answer. Hence section IV.2 is specialy dedicated to Dr. Ben Abeles.