Abstract
Recent work has provided a direct string calculation of the
internal coordinate dependence of gauge field tadpoles on the
orbifold 
3/
3. We investigate the structure
of these profiles in momentum and coordinate space representations
using both analytical and numerical methods. The twisted states are
determined to be localized within a few string lengths of the
singularity. This provides an example of how delta-like
singularities, which are typical for field theories on orbifolds,
are avoided in string theory. A systematic expansion of the full
string result allows us to speculate on how the leading stringy
effects can be incorporated in a field theoretical description. In
one heterotic model, we find that even though tachyons are not
present in the physical spectrum, they totally dominate the tadpole
profile in the vicinity of the fixed point.
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