In , Yates proved the existence of a Turing degree a such that 0, 0’ are the only c.e. degrees comparable with it. By Slaman and Steel , every degree below 0’ has a 1-generic complement, and as a consequence, Yates degrees can be 1-generic, and hence can be low. In this paper, we prove that Yates degrees occur in every jump class.
"Jump operator and Yates degrees." J. Symbolic Logic 71 (1) 252 - 264, March 2006. https://doi.org/10.2178/jsl/1140641173