def make_dataframe_value(nrows: int, ncols: int) -> str:
    """The default value generator for
    `pandas._testing.makeCustomDataframe`.

    Parameter names and descriptions are based on those found in
    `pandas._testing.py`.
        https://github.com/pandas-dev/pandas/blob/b687cd4d9e520666a956a60849568a98dd00c672/pandas/_testing.py#L1956

    Args:
        nrows (int): Number of rows.
        ncols (int): Number of columns.

    Returns:
        str: "RxCy" based on the given position.
    """
    return f"R{nrows}C{ncols}"