xact – Rewriting of all terms in Riemann-Tensor

Is there any command to rewrite all the terms of curvature like $ R $ or $ R _ { alpha beta} $ or $ R _ { alpha beta} ^ {~~~~~ gamma delta} $ in relation to the Riemann tensor $ R _ { alpha beta gamma delta} $ and the metric tensor in xAct?
For example this part of a problem:

(ScriptCapitalL) = 1/(16 Pi G) (-2 (CapitalLambda) + RicciScalarCD())

How can I compare this Lagrange vs. $ R _ {- alpha, – beta, – gamma, delta} $?