  Materials discovery via high-throughput methods relies on the availability of
structural prototypes, which are generally decorated with varying combinations
of elements to produce potential new materials. To facilitate the automatic
generation of these materials, we developed $\textit{The AFLOW Library of
Crystallographic Prototypes}$ $\unicode{x2014}$ a collection of crystal
prototypes that can be rapidly decorated using the AFLOW software. Part 2 of
this work introduces an additional 302 crystal structure prototypes, including
at least one from each of the 138 space groups not included in Part 1. Combined
with Part 1, the entire library consists of 590 unique crystallographic
prototypes covering all 230 space groups. We also present discussions of
enantiomorphic space groups, Wigner-Seitz cells, the two-dimensional plane
groups, and the various different space group notations used throughout
crystallography. All structures $\unicode{x2014}$ from both Part 1 and Part 2
$\unicode{x2014}$ are listed in the web version of the library available at
aflow.org/CrystalDatabase.
