The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey:
  A Catalogue of Strong Galaxy-Galaxy Lens Candidates
  We spectroscopically detected 838 likely, 448 probable, and 265 possible
strong lens candidates within $\approx2$ million galaxy spectra contained
within the extended Baryon Oscillation Spectroscopic Survey (eBOSS) from the
sixteenth data release (DR16) of the Sloan Digital Sky Survey (SDSS). We apply
the spectroscopic detection method of the Baryon Oscillation Spectroscopic
Survey (BOSS) Emission-Line Lens Survey (BELLS) and add Gaussian fit
information, grading, additional inspection observables, and additional
inspection methods to improve our selection method. We observed 477 candidates
with lensing evidence within low-resolution images from both the Legacy survey
of SDSS-I/II and the DESI Legacy survey, which is $12\%$ higher than the
percentage of BELLS candidates observed with similar lensing evidence. Our
search within the latest and improved reductions of the BOSS survey yielded a
$20\%$ increase in the number of lens candidates expected from searching all
BOSS and eBOSS galaxies. The distribution of target and background redshifts of
our candidates is similar to the candidates and confirmed lenses within the
BELLS observations. We present our Spectroscopic Identification of Lensing
Objects (SILO) candidates in a value-added catalogue (VAC) in SDSS DR16. The
examination of these lens candidates in follow-up high-resolution imaging may
yield more than twice the lenses found in previous spectroscopic detection
surveys within SDSS, which would extend the results of previous lens surveys
within SDSS to higher redshifts, constrain models of mass structures in spiral
galaxies, and test if including the identification of possible lensing features
within low-resolution images has merit to spectroscopic detection programs.
