Stereoisomers

Step 1: Understand the types of isomers.
Enantiomers are mirror images of each other, while diastereomers are stereoisomers that are not mirror images.
Constitutional isomers differ in connectivity.
Step 2: Analyze the configuration.
In the case of (1R,2S)-dibromocyclohexane and (1S,2R)-dibromocyclohexane, the configurations of the two chiral centers are different, and they are not mirror images.
Hence, they are diastereomers.