We study the physics of the mercurocuprate family from the structural point of view. We present a phenomenological approach determining the critical temperatures for homologous series HgBa_{2}Ca_{n-1}Cu_{n}O_{2n+2+δ} depending on the number of layers n. The model is based on the Lawrence- Doniach theory of layered superconductors modified for the case of inequivalent layers. The redistribution of charge was taken into account. This leads to observable nonmonotonic "bell"-shaped dependence of T_{c}(n) and provides a quantitative explanation of the experiments.
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