subscales

Hi,

I used in a study with 180 persons a 4 item scale to measure
stereotypes of different outgroups. From the theoretical point of view
(Fiske, 2002) the scale can be divided in two subscales of two items
each.
Question:
How can I proof, if this two-subscale structure is also true for my
random sample? 4 Items are two less for a factor analysis and I don't
think that it would be a good statistically practise just to compare
the Cronbach´s alpha of the 4 item scale with the correlations between
the each two items in the subscales.

thanks for help...

Jan

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