(unrestricted pro crustes rotation after vari max ). the oblique methods would require probably longer paragraphs to describe them, but i didn't plan any long answer today. both methods are mentioned in footnote 5 of this answer . i may refer you to mulaik, foundations of factor a...
The report describes the asymptotic distribution of a quartimax rotation of a principal components loading matrix for principal components factor analysis. The asymptotic distribution of an estimate of this quartimax rotation was found when the estimator is an ORA which is regular and differentiable at ...