Scholarly article about the walls of Jericho. The article isn't aimed at the details you want, but it should have some (scholarly) data, including height and thickness of the walls. With diagrams.
Quote:
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The first perimeter wall, 3.6 m high, was 1.8 m thick at its base and only 1.1 m at its preserved top.
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That's in early bronze age though. about 7000 BC. but it gives a good minimum size.