I don't feel any difference among the following three. 1) the parking lot behind the church 2) the parking lot at the back of the church 3) the parking lot in back of the church But it's my personal opinion. Let's wait for teachers' answers.
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01cite10Clive12cite10 10I see 11i10in back of12i10 as a feature of AmE rather than BrE.12blockquote10You are right. OED says "in back (noun) of X" in AmE is the same as "back (adverb) of X" in BrE.02br