Comment on "On the negative value of dielectric permittivity of the   water surface layer" [Appl. Phys. Lett. 83, 4506 (2003)]
  The recent interpretation of the positive resonance frequency shift in dielectric resonators loaded by water is reviewed. Instead of the invoked negative dielectric constant of water surface layer, it is demonstrated that the experimental results are fully reproduced by taking into account the dielectric losses of the sample. 
G. Annino and M. Cassettari