[en] Subshell photoionization parameters for photoionization from the 4f, 5p, and 5s subshells of atomic ytterbium have been calculated using the relativistic random-phase approximation (RRPA). Interference effects from interchannel coupling of 21 relativistic dipole channels have been included. Interesting differences in the results for 4f parameters relative to a previous eight-channel RRPA calculation have been observed and are attributed to strong effects coming from coupling with the 5p channels