  In models with extra dimensions, branes have been usually treated as solid
bodies though they are prohibited by the relativity. In the previous letter, we
proposed a method of taking account of brane fluctuation by introducing
Nambu-Goldstone bosons, and prove that when a tension of the brane is small,
the interaction between boundary fields and Kaluza-Klein modes is suppressed
exponentially. In this letter, we further investigate this suppression in more
generic configuration, and obtain three counting rules, ``AND'', ``OR'' and
``STACK'' rules, depending on the softness of branes and the character of
fields on the branes four dimensions. The choice determines the number of
Kaluza-Klein towers contributing to renormalization group equations, leading to
a remarkable change in the running behavior of coupling constants.
