I Causality of magnetoresistance

Unable to know the physical happening during magnetoresistance. Would be glad if someone could help me out.
I am currently doing a research project on the topic "Anisotropic magnetoresistance" for which I have referrred various textbooks. All the textbooks state that for this phenomenon to be observed, it is necessary for the object to have more than one carrier type. This has been explained beautifully in a mathematical way in the book "Solid State Physics" by Grosso. However, I have yet to find what happens during magnetoresistance "physically".
I would be very glad if someone could help me.

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