  Reconfigurable intelligent surfaces (RISs) have the potential to enable user
localization in scenarios where traditional approaches fail. Building on prior
work in single-antenna RIS-enabled localization, we investigate the potential
to exploit wavefront curvature in geometric near-field conditions. Via a Fisher
information analysis, we demonstrate that while near-field improves
localization accuracy mostly at short distances when the line-of-sight (LoS)
path is present, it could still provide reasonable performance when this path
is blocked by relying on a single RIS reflection.
