linear mixed-effect model

Dear list,

I am working on a dendrochronological investigation with the use of a 
linear mixed-effect model.

I identified significant main and interactions effects in parameter 
estimation of fixed-effects

Has anyone a hint on how I can generate or receive results and 
statements like:

main/interaction effect of predictor A/AB explained X% of variation of 
growth as response variable.


thanks
CH

P.S.: thanks also for all replies concerning my previous questions. this 
is a great community.