Entropy spectrum of self-affine fractal interfaces created by contract
ion maps is investigated. Interfaces are created by a single (or multi
-) generator(s) all of whose segments have the same anisotropy of scal
ing and different scaling factors. The whole interface is decomposed i
nto many subsets and h (topological entropy), lambda (decay exponent),
Do (divider dimension) and Dg (box dimension) of each subset are calc
ulated. Entropy spectrum is obtained from the relation between h and l
ambda. We find that H (Hurst or roughness exponent), Do and Dg for onl
y the remaining subset at n = infinity are related as D-D = 1/H and D-
B = 2 - H.