ИСТИНА

We propose a new photometric method enabling the derivation of the relative thickness of a galactic disk from the two-dimensional surface-brightness distribution of the galaxy in the plane of the sky. We stress two distinct advantages of our method: firstly, it provides an individual estimate for every galaxy, beyond a statistical approach, and secondly, for the galaxies which orientation differs from edge-on it allows to confront its vertical structure with the radial brightness profile properties. The method is applied to a small sample of images from of the SDSS and S4G of disk galaxies with known radial piece-wise-exponential (with a flatter outer profile) surface-brightness distributions. The accuracy of data is sufficient to derive the thickness of both the inner and outer disks for a few galaxies. Matching the distribution of radial scale and relative thickness in inner and outer disks can lead to interesting conclusions about physics and origin of galactic disks.