CALayer * layer1 = [CALayer layer];
CALayer * layer2 = [CALayer layer];
[layer2 addSublayer: layer1]; // layer2 is the receiver
NSLog(@"layer1 objectid: %@", layer1);
NSLog(@"layer2 objectid: %@", layer2);
NSLog(@"layer1.superlayer objectid: %@",layer1.superlayer);