public String getLayerId() {
        return this.layerId;
    }
<p>
A layer ID. If you use this parameter, <code>DescribeInstances</code> returns descriptions of the instances
associated with the specified layer.
</p>

@return A layer ID. If you use this parameter, <code>DescribeInstances</code> returns descriptions of the
        instances associated with the specified layer.
aws-java-sdk-opsworks/src/main/java/com/amazonaws/services/opsworks/model/DescribeInstancesRequest.java