  In the frames of the DLVO theory the root mean square amplitude of capillary
waves in a thin liquid film is calculated and its dependence on some important
physical parameters is unveiled. Two important models are considered: films
with classical interfaces and films between lipid bilayers. The performed
numerical analysis demonstrates essential difference in their behavior due to
the different elastic properties of the film surfaces. It is shown that the
film lifetime is significantly long at some magic film radii.
