  We study the size-mass relation (SMR) and recent star formation history (SFH)
of post-starburst (PSB) galaxies in the local Universe, using spatially
resolved spectroscopy from the final data release of MaNGA. Our sample includes
489 PSB galaxies: 94 cPSB galaxies with central PSB regions, 85 rPSB galaxies
with ring-like PSB regions and 310 iPSB galaxies with irregular PSB regions.
When compared to control galaxies of similar SFR, redshift and mass, a similar
SMR is found for all types of PSB samples except the cPSB galaxies which have
smaller sizes at intermediate masses ($9.5\lesssim \log_{10}(\rm
M_\ast/M_\odot)\lesssim 10.5$). The iPSB galaxies in the star-forming sequence
(iPSB-SF) show no/weak gradients in $\textrm{D}_{n}(4000)$,
$\textrm{EW}(\textrm{H}\delta_{A})$ and $\textrm{EW}(\textrm{H}\alpha)$,
consistent with the global star-forming status of this type of galaxies, while
the quiescent iPSB (iPSB-Q) sample shows negative gradients in
$\textrm{D}_{n}(4000)$ and positive gradients in
$\textrm{EW}(\textrm{H}\delta_{A})$, indicating older stellar populations in
the inner regions. Both cPSB and rPSB samples show positive gradients in
$\textrm{D}_{n}(4000)$ and negative gradients in
$\textrm{EW}(\textrm{H}\delta_{A})$, indicating younger stellar populations in
the inner regions. These results imply that the four types of PSB galaxies can
be broadly divided into two distinct categories in terms of evolutionary
pathway: (1) iPSB-SF and iPSB-Q which have SMRs and SFHs similar to control
galaxies, preferring an inside-out quenching process, (2) rPSB and cPSB which
appear to be different stages of the same event, likely to follow the
outside-in quenching process driven by disruption events such as mergers that
result in a more compact structure as quenching proceeds.
