We measured the complex transverse acoustic impedance of superfluid 3Hein the B phase by coating a surface with 4He to study the boundary condition dependenceof the surface bound states. Observed features in the temperature dependencewere similar to those without 4He coating. However, temperatures showing singularitiesbecame higher and variations in the dependence became smaller. The smallvariations indicated that a specular surface was realized by the 4He coating. Increasein the singularity temperature indicated that the bandwidth of the surface Andreevbound states became broader by the coating.
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