( ( ( ( The layer ) ( above ( the troposphere ) ) ) ( -LRB- ( stratosphere -RRB- ) ) ) ( ( contains ( ( the ( highest concentration ) ) ( of ozone ) ) ) . ) )
(ROOT (S (NP (NP (NP (DT The) (NN layer)) (PP (IN above) (NP (DT the) (NNP troposphere)))) (PRN (-LRB- -LRB-) (NP (NN stratosphere)) (-RRB- -RRB-))) (VP (VBZ contains) (NP (NP (DT the) (JJS highest) (NN concentration)) (PP (IN of) (NP (NN ozone))))) (. .)))
The layer above the troposphere (stratosphere) contains the highest concentration of ozone.
(ROOT (S (NP (DT The) (NN stratosphere)) (VP (VBZ is) (NP (NP (DT the) (NN layer)) (PP (IN above) (NP (DT the) (NNP troposphere))))) (. .)))