Distance between corner reflectors

May I know the minimum distance between two corner reflectors (1 meter size, trihedral)when deployment is done on the same field, to avoid the overlapping of both in SAR image?

It depends on many factors, I could name them as external and internal factors, for instance the internal factors are related to the band and image resolution et. al. And externa for example, the area of your field (Is it an open or limited area?) But I know that you focused in your question on the overlap so it is internal factors,

Take a look at this

Corner reflector deployment for X-band SAR interferometry to monitor the landslide of Carlantino, Daunia Region (Italy)

It’s limited area @falahfakhri