The iodine laser temperature jump (ILTJ) is used to perturb an AOT water-in-oil microemulsion. From the dynamic response to such a perturbation, it is possible to calculate the bending elastic modulus of the AOT interfacial monolayer. At large water content, this value is close to 0.4 kT, which is consistent with the value obtained by other techniques. It is shown that increasing the droplet concentration at constant micellar radius induces a slight increase of the interfacial fluidity. From the amplitude of the response to the thermal perturbation, the percolation process of a reverse micellar solution can be studied with great accuracy.