Cluster-Cluster Lensing and the Case of Abell 383
  Extensive surveys of galaxy clusters motivate us to assess the likelihood of
cluster-cluster lensing (CCL), namely, gravitational-lensing of a background
cluster by a foreground cluster. We briefly describe the characteristics of
CCLs in optical, X-ray and SZ measurements, and calculate their predicted
numbers for $\Lambda$CDM parameters and a viable range of cluster mass
functions and their uncertainties. The predicted number of CCLs in the
strong-lensing regime varies from several ($<10$) to as high as a few dozen,
depending mainly on whether lensing triaxiality bias is accounted for, through
the c-M relation. A much larger number is predicted when taking into account
also CCL in the weak-lensing regime. In addition to few previously suggested
CCLs, we report a detection of a possible CCL in A383, where background
candidate high-$z$ structures are magnified, as seen in deep Subaru
observations.
