Rodinal is a single developing agent p-aminophenol
This is my collection of developing agent temperature coefficients so far:
Ratio of increase in development time that occurs when the temp. is increased 10C.
Temperature coefficient = T1/T2
When the developer contains two developing agents, the coefficient is useful over a limited range.
(Basic photographic materials and processes-Stroebel, Current, Zakia)
Mees & James
Multi developer coefficient's (i.e. MQ) work only over a range of temps. I don't have the limits, sorry.