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Structure of least-energy solutions to singularly perturbed semilinear smooth domain, is precisely studied as ε→ 0+, for 0 ＜α＜ 1 and a superlinear,subcritical nonlinearity g(u). It is shown that there are many least-energy solutions for the problem and they are spike-layer solutions. Moreover, the measure of each spike-layer is estimated as ε→ 0+.