A sample of AWS Lambda Layer

LambdaLayers.yaml

    SeleniumChromiumLayer:
        Type: AWS::Lambda::LayerVersion
        Properties:
            CompatibleRuntimes:
                - python3.7
                - python3.6
            Content:
                S3Bucket: 
                    Ref: BucketName
                S3Key: 
                    Fn::Sub: '${SourceFolder}/SeleniumChromiumLayer.zip'
            Description: Selenium and Chromium Layer for Python3.6
            
    SampleFunction:
        Type: AWS::Lambda::Function
        Properties:
            Runtime: python3.7
            Description: Sample function 
            Handler: src/lambda_function.lambda_handler
            Role: 
                Fn::GetAtt: [ "SampleFunctionRole", "Arn" ]
            Timeout: 15
            MemorySize: 512
            Code:
                S3Bucket: 
                    Ref: BucketName
                S3Key: 
                    Fn::Sub: '${SourceFolder}/SampleFunction.zip'
            Layers:
                - Ref: SeleniumChromiumLayer